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Abbott, R. T., 1974. (2 ed.). American seashells. New York, Cincinnati, Toronto, London, Melbourne (van Nostrand Reinhold Co.): 1-663, 6405 figs.

Almogi-Labin, A. and Reiss, Z., 1977a. Quaternary pteropods from Israel, 1. Holocene and Pleistocene pteropods from the Mediterranean continental shelf and slope of Israel; 2. Pteropods from Recent sediments in the Gulf of Elat. Rev. Españ. Micropaleont. 9(1): 5-48, 9 figs, 10 pls.

Almogi-Labin, A., Hemleben, C. and Deuser, W. G., 1988. Seasonal variation in the flux of euthecosomatous pteropods collected in a deep sediment trap in the Sargasso Sea. Deep-Sea Res., 35(3): 441-464, 4 tabs, 22 figs.

Almogi-Labin, A., 1975. Pleistocene and holocene pteropods from the eastern Mediterranean and the Gulf of Elat. 4th Rap. H. Steinitz Mar. biol. Lab. Elat: 14-15 (mimiogr.).

Aron, W., 1960. Animals in the eastern North Pacific and its relationship to physical and chemical conditions. Univ. Wash. Dep. oceanogr. Tech Rep. 63: 65-154 .

Aron, W., 1962. The distribution of animals in the eastern North Pacific and its relationship to physical and chemical conditions. J. Fish. Res. Brd Canada 19(2): 271-314, 13 figs.

Barash, A. and Danin, Z., 1971a. Opisthobranchia (Mollusca) from the Mediterranean waters of Israel. Israel J. Zool. 20 (First Ann. Symp. Israel Malac. Soc.): 151-200, 3 tabs, 3 pls, 2 maps.

Bé, A. W. H. and Gilmer, A. W., 1977. A zoogeographic and taxonomic review of euthecosomatous Pteropoda. In: A. T. S., Ramsay (ed). Oceanic Micropalaeontology I. Acad. Press London: 733-808.

Bellini, R., 1905b. Les ptéropodes des terrains tertiaires en quaternaires d'Italie. Ann. Soc. r. zool. malac. Belgique 40: 23-45, figs 9-47.

Benoit, L., 1843. Ricerche malacologiche. Messina (Capra). Farfalletta. Opera periodica Scientifica Letteraria Artistica, Dispensa XI e XVI. Nuova Serie: 3-12, 2 pls.

Berkeley, E. and Berkeley, C., 1960. Some further records of pelagic Polychaeta from the northeast Pacific north of latitude 40°N and east of longitude 175°W, together with records of Siphonophora, Mollusca and Tunicata from the same region. Can. J. Zool. 38: 787-799.

Biekart, J. W., 1989. Euthecosomatous pteropods as paleohydrological and paleoecological indicators in a Tyrrhenian deep-sea core. Palaeogeogr. Palaeoclim. Palaeoecol. 71: 205-224, 2 tabs, 6 figs, 2 pls.

Boas, J. E. V., 1886a. Bidrag til Pteropodernes. Morfologi of Systematik samt til Kundskaben om deres geografiske Udbredelse- Spolia Atlantica- Vidensk. Selsk. Skr. (6 Raekke) naturv. math. IV (1): 1-231.

Boltovskoy, D., 1971b. Pteropodos thecosomados del Atlantico sudoccidental. Malacologia 11(1): 121-140, 1 pl.

Boltovskoy, D., 1973. Los eutecosomados del Mar Argentino y adyacencias (Mollusca, Pteropoda). Physis (Asoc. Argent. Cienc. Natur.) (A)32(85): 395-411, 1 tab., 1 text-fig., 18 figs (on 2 pls).

Boltovskoy, D., 1975a. Ecological aspects of zooplankton (Foraminifera, Pteropoda and Chaetognatha) of the southwestern Atlantic Ocean. Veliger 18(2): 203-216, 3 tabs, 7 figs.

Bonnevie, K., 1913 (reprinted 1933). Pteropoda from the Michael Sars North-Atlantic Deep-Sea expedition. Rep. Sci. Res. 'Michael Sars' North Atl. Deep-Sea exp. 3(1): 1-69, 4 tabs, 58 figs, 9 pls.

Bosc, [L. A. G.], 1824 (2nd. ed.). Histoire naturelle des coquilles, 1-2. Paris (Verdiere): 1-336, 1 pl. (1); 1-325, 15 pls (2).

Cantraine, F., 1841. Malacologie méditerranéenne et litorale, ou description des mollusques quivivent dans la Méditerranée ou sur le continent de l'Italie, ainsi que des coquilles qui se trouvent dans les terrains tertiaires italiens, avec des observations sur leur anatomie, leurs moeurs, leur analogie et leur gisement. Ouvrage servant de faune malacologique italienne et de complément à la Conchiologia fossile subapennina de Brocchi. Mém. Acad. R. Brux. 13: 1-173, 6 pls.

Casanova, J.-P., 1980. Campagnes du 'Meteor' dans 'Atlantique N-E. Siphonophores, méduses et thécosomes. Distribution verticale et comparaisons faunistiques avec la Méditerranée. 'Meteor' Forschungserg. (D)32: 15-32, 6 tabs, 6 figs.

Chen, C. and Bé, A. W. H., 1964b. Seasonal distributions of euthecosomatous pteropods in the surface waters of five stations in the western North Atlantic. Bull. Mar. Sci. Gulf Caribb. 14 (2): 185-220.

Chen, C. and Hillman, N. S., 1970. Shell-bearing pteropods as indicators of water masses off Cape Hatteras, North Carolina. Bull. Mar. Sci. Gulf Caribb. 20(2): 350-367, 4 tabs, 3 figs.

Croce, N. della and Frontier, S., 1966. Thecosomatous pteropods from the Mozambique Channel. Boll. Mus. Inst. Biol. Univ. Genova 34(207): 107-113, map.

Cuvier, G. L. C. F. D., 1817. Le regne animal distribué d'apres son organisation, pour servir de base à l'histoire naturelle des animaux et d'introduction à l'anatomie comparée, 2. Paris (Deterville): ixviii, 1-532.

Orbigny, A. d', 1836-1844. Mollusques, echinodermes, foraminifäres et polypiers, recueillis aux Iles Canaries par MM. Webb et Berthelot. In: P. B. Webb and S. Berthelot (eds). Histoire naturelle des Iles Canaries 2(2): 1-117, 7 pls.

Orbigny, A. d', 1836-1846. Voyage dans l'Amérique méridionale (le Brésil, la république orientale de l'Uruguay, la république Argentine, la Patagonie, la république du Chili, la république de Bolivia, la république du Pérou), exécuté pendant les années 1826, 1827, 1828, 1829, 1830, 1831, 1832 et 1833, 5(3). Mollusques. Paris (Bertrand).

1-48 are from 1835.

49-184 are from 1836.

185-376 are from 1837.

377-408 are from 1840.

409-488 are from 1841.

489-758 are from 1846.

atlas 20 pls is from 1846.

Orbigny, A. d', 1841-1855. Mollusques, 1. In: R. de la Sagra. Histoire physique, politique et naturelle de l'Ile de Cuba. Paris (Bertrand): 376 pp. (1855), atlas 28 pls (1853).

Dadon, J. R. and Boltovskoy, D., 1982. Zooplanktonic recurrent groups (Pteropoda, Euphausiacea, Chaetognatha) in the southeastern Atlantic Ocean. Physis Secc., (A)41(100): 63-83.

Dadon, J. R., 1989. Pteropoda Euthecosomata del Mar Epicontinental Argentino y Adyacencias. Thesis Univ. Buenos Aires: 1-285. (mimiogr.)

Dall, W. H., 1871. Descriptions of sixty new forms of mollusks from the west coast of North America and the north Pacific Ocean, with notes on others already described. Amer. J. Conch. 7(2): 93-160, pls 13-16.

Dall, W. H., 1921. Summary of the marine shell-bearing mollusks of the north west coast of America, from San Diego, California to the polar sea, mostly contained in the collection of the United States National Museum, with illustrations of hitherto infigured species. Smithonian Inst. U. S. Nat. Mus. Bull. 112: 1-217, pls 1-22.

Davenport, J. and Bebbington, A., 1990. Observations on the swimming and buoyancy of some thecosomatous pteropod gastropods. J. Moll. Stud. 56: 487-497.

Blainville, [H. M. D.] de, 1821a. (Malacoz.). Dictionnaire des Sciences Naturelles 22: 1-570.

Jong, K. M. de, and Coomans, H. E., 1988. Marine Gastropods from Curaçao, Aruba and Bonaire. Sud. fauna Curaçao other Caribb. Isl. 121: 1-216.

Deevey, G. B., 1971. The annual cycle in quantity and composition of the zoo-plankton of the Sargasso Sea off Bermuda, 1. The upper 500 m. Limn. Oceanogr. 16(2): 219-240.

Deshayes, G. P., 1823. Dictionnaire classique d'histoire naturel, 4. Paris (Rey and Gravier, Baudouin):. 1-628.

Dieci, G., 1962. Pteropodi langhiani di Rio delle Bàgole (Montegibbio, Appennino settentrionale modenese). Boll. Soc. Paleont. Ital. 1(2): 31-42, pls 15-16.

Diester-Haass, L. and Spoel, S. van der, 1978. Late Pleistocene pteropod-rich sediment layer in the N. E. Atlantic and protoconch variation of Clio pyramidata Linnaeus, 1767. Palaeogeogr., Palaeoclim., Palaeoecol. 24: 85-109.

Fabry, V. J., 1989a. Aragonite production by pteropod mollusks in the subarctic Pacific. Deep-Sea Res. 36: 1735-1751.

Fiege, D., 1990a. Morphology of the wings of Euthecosomatous pteropods. Amer. Malacol. Bull. 8(1): 27-36.

Franc, A., 1959. 10 Mollusques pélagiques. Campagne de la 'Calypso': Gulfe de Guinée. Ann. Inst. Océanogr. (NS) 37(4): 241-244, 1 fig.

Froget, C. and Pastouret, L., 1972. Les ptéropodes, moyen d'étude de la chronoclimatologie quaternaire. Comparaison de deux carottes prélevées en Méditerranée occidental et orientale. Rapp. Comm. int. Explor. Sci. Mer Médit., Monaco 20(4): 611-614.

Frontier, S., 1963a. Héteropods et ptéropodes récoltes dans le plankton de Nosy-Bé. Cah. ORSTOM 6(2): 213-227.

Frontier, S., 1963c. Zooplancton récolté en mer d'Arabie, Golfe Persique et Golfe d'Aden, 2. Ptéropodes, systématique et répartition. Cahiers ORSTOM, sér. océanogr. 6 (sér. Nosy-Bé, 2): 233-254.

Frontier, S., 1973c. Zooplancton de la région de Nosy-Bé, 7. Ptéropodes, hétéropodes, 2. Especes néritiques. externes et océaniques tolérantes. Cah. ORSTOM, sér. océanogr. 11(3): 291-302.

Frontier, S., 1973c. Zooplancton de la région de Nosy-Bé, 7. Ptéropodes, hétéropodes, 2. Especes néritiques. externes et océaniques tolérantes. Cah. ORSTOM, sér. océanogr. 11(3): 291-302.

Gabe, M., 1959. Particularités histochimiques de la glande hypobranchiale des ptéropodes thécosomes. Ann. Histochim. 4(2): 85-93.

Gardner, N. W., 1979. Sea butterflies. Poirieria 10 (1): 13-20.

Gegenbaur, C., 1855b. Untersuchungen über Pteropoden und Heteropoden. Ein Beitrag zur Anatomie und Entwicklungsgeschichte dieser Thiere. Leipzig (Engelmann): i-vii, 1-228, 8 pls.

Gilmer, R. W. and Harbison, G. R., 1986. Morphology and field behavious of pteropod molluscs: feeding methods in the families Cavoliniidae, Limacinidae and Peraclididae (Gastropoda: Thecosomata). Mar. Biol. 91: 47-57, 1 tab., 7 figs.

Gilmer, R. W., 1990a. In situ observations of feeding behavior of thecosome pteropod molluscs. Amer. Malac. Bull. 8(1): 53-59.

Glaçon, G., Rampal, J., Gaspard, D., Guillaumin, D. and Staerker, T. S., 1994. Thecosomata (pteropods) and their remains in Late Quaternary deposits on the Bougainville Guyot and the Central New Hibrides Island Arc. Proc. Ocean Dril. Progr. Sci. Res. 134: 319-334

González, C. and Princz, D., 1979. Moluscos heteropodos y pteropodos de la zone central del caribe venezolano. Bol. Inst. oceonogr. Cumana 18(1-2): 99-107.

Gould, A. A., 1852. United States exploring expedition. During the years 1838, 1839, 1840, 1841, 1842. Under the command of Charles Wilkes, U. S. N. 12. Boston (Gould and Lincoln): i-xv, 1-510 (atlas: see Gould 1856).

Gould, A. A., 1852. United States exploring expedition. During the years 1838, 1839, 1840, 1841, 1842. Under the command of Charles Wilkes, U. S. N. 12. Boston (Gould and Lincoln): i-xv, 1-510 (atlas: see Gould 1856).

Gray, J. E., 1850. Catalogue of the Mollusca in the collection of the British Museum, 2. Pteropoda. London (British Museum, E. Newman): iv + 45 pp.

Grazzini, V. C. and Rosenberg, H. Y., 1969. Étude paléoclimatique d'une carotte de Méditerranée orientale. Revue Geogr. phys. Géol. dynam. (2)11(3): 279-292, 3 figs, 1 pl.

Grecchi, G. and Bertolotti, M., 1988 Interpretazione paleoclimatica della carota CG18-BAN82 basata sull'analisi di Thecosomata Euthecosomata del Quaternario del Mediterraneo orientale. Bull. Mus. Reg. Sci. Nat. Torino 6(1): 73-132.

Grecchi, G., 1975a. Pteropoda fossili a Castell'Arquato. Conchiglie 11(11-12): 225-232, 1 pl.

Grecchi, G., 1982. Pteropodi pliocenici dell'Italia settentrionale. Riv. Ital. Paleont. 87(4): 703-738, 2 tabs, 5 figs, pls 52-54.

Grecchi, G., 1984. Molluschi planctonici e bentonici in sedimenti sapropelitici del Quaternario della dorsalee Mediterranea. Boll. Malacologico 20(1-4): 1-34, 3 pls.

Haagensen, D. A., 1976 Caribbean zooplankton. Part II. Thecosomata. Off. Nav. Res. Dept. of the Navy. U. S. Govt. Print Off. Washington D. C.: 551-712.

Harbison, G. R. and Gilmer, R. W., 1992. Swimming, buyoyancy and feeding in shelled pteropods: a comparison of field and laboratory observations. J. Moll. Stud. 58: 337-339.

Hedley, C., 1917. A checklist of the marine fauna of New South Wales, 1. Proc. Roy. Soc. N. S. W. 51: M1-M120.

Herman, Y., 1971b. Vertical and horizontal distribution of pteropods in quaternary sequences. In: B. M. Funnel and W. R. Riedel. The micropalaeontology of oceans: 468-486. Univ. Press, Cambridge.

Hida, T. S., 1957. Chaetognaths and pteropods as biological indicators in the North Pacific. U. S. Fish and Wildlife Service, Special Science. Report Fisheries 215: 1-13.

Hubendick, B., 1951. Pteropoda, with a new genus. Further zoological results of the Swedish Antarctic Expedition 1901-1903, 4(6): 1-10.

Ivanova, E. V., 1983 Pteropoda as indicators of palaeo-environment. Okeanologia 23 (5): 839-845. [in Russian]

Ivanova, E. V., 1985. Late Quaternary biostratigraphy and paleotemperatures of the Red Sea and the Gulf of Aden based on planktonic Foraminifera and pteropods. Mar. Micropal. 9: 335-364.

Kalberer, M., Fischer, G., Pätzold, J., Donner, B., Segl, M. and Wefer, G., 1993. Seasonal sedimentation and stable isotope records of pteropods off Cap Blanc. Mar. Geol. 113: 305-320.

Kay, E. A., 1966. Pteropods in Hawaiian waters. Hawaiian Shell News 14 (6) (ns 76): 1-2, 4 figs.

Lamarck, [J. B. P. A. de], 1819. Histoire naturelle des animaux sans vertebres, présentant les caracteres généraux et particuliers de ces animaux, leur distribution, leurs classes, leurs familles, leurs genres, et la citation des principales especes qui s'y rapportent; précédée. etc. etc., 6(1). Paris (Lamarck): 1-343.

Lesueur, [J. A.], 1813. Mémoire sur quelques especes d'animaux mollusques et radiaires recueillis dans la Méditerranée, pres de Nice. Nouv. Bull. Sci. Soc. Philom. 3: 281-285, pl. 5.

MacPherson, J. H. and Gabriel, C. L., 1962. Marine mollusca of Victoria. Thecosomata: 248-250.

Magaldi, N. H., 1974. Moluscos holoplanktonicos del Atlantico sudoccidental. I Pteropodos euthecosomados colectados por el "Atlantis II" en marzo de 1971. Comunicac. Soc. Malacol. Uruguay 4(27): 1-20.

Magaldi, N. H., 1977a. Moluscos holoplanctonicos del Atlantico suboccidental. III. Heteropods y pteropods de aguas superficiales Brasilenas y Uruguayas. Com. Soc. Malac. Urug. 4 (33): 295-325.

Massy, A. L., 1909. The Pteropoda and Heteropoda of the coast of Ireland Fisheries, Ireland. Scient. Invest. Dept. Agric. Techn. Instruct. Ireland 2: 1-52, pl. 1.

McGowan, J. A. and Fraundorf, V. J., 1966. The relationship between size and net used and estimates of zooplankton diversity. Limn. Oceanogr. 11(4): 456-469.

McGowan, J. A., 1960. The systematics, distribution, and abundance of the Euthecosomata of the North Pacific. San Diego (Ph. D. thesis University of California): 1-212, 17 tabs, 54 figs.

McGowan, J. A., 1967. Distributional atlas of pelagic molluscs in the California Current region. CALCOFI Atlas 6: 1-218.

McGowan, J. A., 1968. The Thecosomata and Gymnosomata of California. Veliger 3 (suppl.): 103-130, pls 12-20.

Meisenheimer, J., 1905c. Pteropoda. Deutsch. Tiefsee Exp. 1898-1899 IX: 1-314, Atlas Pl. 1-27 Map 1-9.

Menzies, R. J., 1958. Shell-bearing pteropod gastropods from mediterranean plankton (Cavoliniidae). Pubbl. Staz. Zoologica Napoli 30 (3): 381-401, 5 tabs, 9 figs, 8 maps.

Menzies, R. J., 1958. Shell-bearing pteropod gastropods from mediterranean plankton (Cavoliniidae). Pubbl. Staz. Zoologica Napoli 30 (3): 381-401, 5 tabs, 9 figs, 8 maps.

Michel, H. B. and Michel, J. F., 1991 Heteropoda and Thecosomata (Mollusca: Pteropoda) macroplankton in the Florida straits. Bull. Mar. Sci. 49(1/2): 562-574.

Mosquera, E. R. and Pedrosa, G. P. G., 1981. Molluscs collected at the Galicia Bank (Spain). Conchiglia 13: 6-7.

Newman, L. and Corey, S., 1984. Aspects of the distribution and biology of pteropods (Gastropoda. Opisthobranchia) from the Bay of Fundy region, Canada. Can. J. Zool. 62: 397-404.

Newman, L. J., 1990. Holoplanktonic molluscs (Gastropoda; Thecosomata, Gymnosomata, and Heteropoda) from the waters of Australia and Papua New Guinea: their taxonomy, distribution and biology. PhD Thesis Univ. Qld. Australia. 208 pp.

Nordsieck, F., 1976. Abyssal molluscs from the Ionic Sea. Conchiglia 5(11-12): 4-7.

Ode, H., 1991. Distribution and records of the marine mollusca in the North-West Gulf of Mexico. Texas Conch. 27(3/4): 72-83.

Okutani, T., 1957a. Holoplanktonic Gastropoda in the 'Kuroshio' area, south of Hinshu, May 1955. Rec. oceanogr. Wks. Japan, (NS) Spec. No.: 134-142, 3 figs.

Okutani, T., 1965. Heteropoda and Thecosomata in the Kuroshio. Bull. Plankt. Japan 12: 37-39.

Pafort-van Iersel, G. J. S. and Spoel, S. van der, 1986. Schizogamy in the planktonic opisthobranch Clio – a previously undescribed mode of reproduction in the Mollusca. Intern. J. Invert. Reprod. Developm. 10 (1): 43-50.

Pafort-van Iersel, G. J. S., 1979. The columellar muscle system in Clio pyramidata and Cymbulia peroni (Pteropoda, Thecosomata). Malacologia 18(1-2): 31-35, 4 figs.

Pafort-van Iersel, G. J. S., 1982. Variation in Diacria trispinosa (de Blainville, 1821) and Clio pyramidata Linnaeus, 1767 (Pteropoda, Mollusca) of the Amsterdam Mid North Atlantic Plankton Expedition 1980. Beaufortia 32(6): 97-115, 6 tabs, 8 figs, 1 pl.

Pafort-van Iersel, G. J. S., 1985a. Contributions to pelagic zoogeography of the mid North Atlantic Ocean, 1. Distribution of pteropods, heteropods and silver hatchetfishes. In: G. J. S. Pafort-van Iersel. A contribution to pelagic zoogeography of the mid North Atlantic Ocean (7th paper) (Thesis Univ. van Amsterdam): 1-45, 5 tabs, 4 figs, 27 append.

Peck, J. I., 1894. Scientific results of explorations by the U. S. Fish commission steamer Albatross, 26. Report on the pteropods and heteropods collected by the U. S. Fish commission steamer Albatross during the voyage from Norfolk, Va., to San Francisco, Cal., 1887-1888, 1. The thecosomatous pteropods. Proc. U. S. Nat. Museum, (1893) 16: 451-466, pls 53-55.

Pelseneer, P., 1888a. Report on the Pteropoda collected by H. M. S. Challenger during the years 1873-1876, 2. The Thecosomata Reports on the scientific. Results of the voyage of H. M. S. Challenger during the years 1873-1876 (zool.) 23(1): 1-132, 2 figs, 2 pls.

Pfeffer, G., 1880b. Die Pteropoden des Hamburger Museums. Abhandlu. Naturwissensch. Ver. Hamburg 7: 69-99, pl. 7.

Pietzner, H. and Richter, G., 1986. Rezente Phosphorit Bildung im Auftriebsgebiet vor der NW-afrikanischen Küste. Senckenbergiana marit. 17 (4-6): 333-377, 5 tabs, 12 pls.

Pokora, Z., 1989. Strobilation as a form of asexual reproduction in certain pteropods (Gastropoda, Opisthobranchia). Functional significance of this process in their life cycle. Przegl. Zool. 33(3): 397-410.

Pruvot-Fol, A., 1954. Mollusques opisthobranches. Faune de France 58. Paris (Lechevalier): 1-460, 173 figs, 1 pl.

Quoy, J. R. C. and Gaimard, J., 1832. Voyage de découvertes de l'Astrolabe, exécuté par ordre du roy, pendant les années 1826-1827-1828-1829, sous le commendement de M. J. Dumont d'Urville. Zoologie, 2: 1-686 (1832); atlas (with slightly differing title) mollusques pls 1-93, zoophytes pls 1-26 (without explications) (1833).

Rampal, J., 1965a. Ptéropodes thécosomes indicateurs hydrologiques. Rev. Trav. Inst. Pàches Marit. (Paris) 29(4): 393-400, 5 figs.

Rampal, J., 1966. Pèches planctoniques superficielles et profondes en Méditerranée occidentale (campagne de la 'Thalassa', janvier 1961, entre les îles Baléares, la Sardaigne et l'Algérois, 6). Ptéropodes. Rev. Trav. Inst. Pàches Marit. (Paris) 30: 375-383, 6 figs.

Rampal, J., 1967. Répartition quantitative et bathymétrique des ptéropodes thécosomés récoltés en Méditerranéee occidentale au Nord du 40° parallèle. Remarques morphologiques sur certaines espèces. Rev. Trav. Inst. Pèches Marit. (Paris) 31(4): 1-13.

Rampal, J., 1968a. Les ptéropodes thécosomes en Méditerranée. Comm. Int. Explor. sci. Mer Méditerr.: 1-142, 6 tabs, 12 figs. (PhD thesis).

Rampal, J., 1968b. Neurosécrétion chez quelques ptéropodes thécosomes. Rapp. Proc.-verb. Réunion Comm. intern. Explor. scient. Mer Médit. 19(3): 543-545, 1 fig.

Rampal, J. 1971a. Les thécosome d'une thanatocoenose du N. W. du Golf de Gascogne. In: Peuplements profonds du Golf de Gascogne: 549-550.

Rampal, J., 1973a. Clés de détermination des ptéropodes thécosomes de Méditerranée et de l'Atlantique euroafricain. Rev. Trav. Inst. Pàches Marit. (Paris) 37(3): 369-381.

Rampal, J., 1975. Les thécosomes (mollusques pélagiques). Systématique et évolution écologie et biogéographie méditerranéennes. Aix-Marseille (Thesis Univ. Provence CNRS AO 11932): 1-485, 15 tabs, 99 figs.

Rampal, J., 1980a. Biogeographie Méditerranéne d'apres l'etude des Thécosome (Mollusques pelagiques). J. Etud. Syst. Biogeogr. Médit Cagliari CIESM: 45-54.

Rao, T. S. S., 1979. Zoogeography of the Indian Ocean. In: Spoel, S. van der and Pierrot-Bults, A. C. (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 254-292.

Richter, G., 1973b. Zur Stammesgeschichte pelagischer Gastropoden. Natur und Museum 103(8): 265-275, 4 tabs, 9 figs.

Richter, G., 1977. Jäger, Fallensteller und Sammler. Zur Ernährung planktonischer Schnecken. Natur und Museum 107: 221-234.

Richter, G., 1979. Die thecosomen Pteropoden der "Meteor"-Expedition in den Indischen Ozean 1964/65. "Meteor" Forsch. Ergebnisse (D) 29: 1-29.

Risso, A., 1826. Histoire naturelle des principales productions de l'Europe méridionale et particulièrement de celles des environs de Nice et des Alpes maritimes 4: 1-439, 183 figs.

Roskin, G., 1925a. Die Drüsenzelle von Pteropoda. Z. Zellforsch. mikr. Anat. 3: 99-130, 18 figs, 1 pl.

Rottman, M., 1976. Euthecosomatous pteropods (Mollusca) in the Gulf of Thailand and the South China Sea: seasonal distribution and species associations. Naga Rep. 4 (6): 1-117.

Rottmann, M. L., 1978. Ecology and recurrent groups of pteropods, euphasiids and chaetognaths in the Gulf of Thailand and the South China Sea. Mar. Biol. 48(1): 63-78, 7 tabs, 4 figs.

Sakthivel, M., 1967. A preliminary report on the distribution and relative abundance of Euthecosomata with a note on the seasonal variation of Limacina species in the Indian Ocean. In: Proc. Symp. 'Indian Ocean' March 1967. Bull. N. I. S. I. 38: 700-717, 17 figs.

Sakthivel, M., 1975. A note an the annual variation of the euthecosomatous pteropods along the meridian 78° East in the Indian Ocean. Bull. Plank. Soc. Japan 21: 41-44.

Sakthivel, M., 1976a. Geographical and seasonal distribution of Euthecosomata (Pteropoda, Gastropoda) in the Indian Ocean. Meteor Forsch. Ergebniss D23: 1-22.

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Summary (in Dutch also published separately)

Spoel, S. van der, 1968b. The shell and its shape in Cavoliniidae (Pteropoda Gastropoda). Beaufortia 15 (206): 185-189.

Spoel, S. van der, 1969b. The shell of Clio pyramidata Linnaeus, 1767 forma lanceolata (Lesueur, 1813) and forma convexa (Boas, 1886)(Gastropoda, Pteropoda). Vidensk. Medd. Dansk. Natur. Foren. 132: 95-114.

Spoel, S. van der, 1970a. Morphometric data in Cavoliniidae with notes on a new forma of Cuvierina columnella (Rang, 1927) (Gastropoda, Pteropoda). Basteria 34 (5-6): 103-151.

Spoel, S. van der, 1970b. The pelagic Mollusca from the 'Atlantide' and 'Galathea' expeditions collected in the East Atlantic. Atlantide Reports 11: 99-139, 24 figs.

Spoel, S. van der, 1971b. Some problems in infraspecific classification of holoplanktonic animals. Zeitschr. Zool. Syst. Evol. 9 (2): 107-138.

Spoel, S. van der, 1972b. Pteropoda, Thecosomata. Cons. int. Expl. Mer. Zooplankton Sheet 140-142: 1-12.

Spoel, S. van der, 1973a. Clio pyramidata Linnaeus, 1767 forma convexa (Boas, 1886) (Mollusca, Pteropoda). Bull. zool. Mus. Univ. Amst. 3 (3): 15-20.

Spoel, S. van der, 1973b. Growth, reproduction and vertical migration in Clio pyramidata Linnaeus, 1767 forma lanceolata (Lesueur, 1813) with notes on some other Cavoliniidae (Mollsuca, Pteropoda). Beaufortia 21 (281): 117-134.

Spoel, S. van der, 1973e. Pneumodermopsis teschi n. sp. and notes on some other Pteropoda of the "Thor Expeditions 1903-1910" (Gastropoda). Bull. zool. Mus. Univ. Amst. 3 (9): 53-64.

Spoel, S. van der, 1973f. Strobilation in a mollusc; the development of aberrant stages in Clio pyramidata Linnaeus, 1767 (Gastropoda, Pteropoda). Bijdr. Dierk. 43 (2): 202-215, pls I-II.

Spoel, S. van der, 1975a. Preliminary note on variation of protoconchae of Clio pyramidata Linnaeus, 1767 (Mollusca, Pteropoda). Bull. zool. Mus. Univer. Amst. 4 (21): 187-190.

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Clio pyramidata lanceolata