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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.

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.

Bianco, S. Lo, 1904. Pelagische Tiefseefischerei der 'Maya' in der Umgebung von Capri. In: Beitrege zur Kenntnis des Meeres und seiner Bewohner. Jena (G. Fischer Verlag): i-vi, 1-91, 179 figs, 1 map, 42 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.

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.

Costa, O. G., 1840-1873 (continued by A. Costa). Fauna del regno di Napoli ossia enumerazione di tutti gli animali che. Animali molli, classe II. Pteropodi (Pteropoda, Cuv.) (published without title-page). Napoli: 1-10, pls 1-2 (O. G. Costa, 1840); 11-28, pls 3-5 (A. Costa, 1873).

Costa, A., 1869. Osservazioni su taluni pteropodi del Mediterraneo. Ann. Museo Zool. R. Univ. Napoli 5: 44-46, pl. 1.

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.

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

Guérin-Ménéville, F. E., 1844. Iconographie du règne animal de G. Cuvier (Mollusques): 1-64, pls. 1-38 (in separate vol.) Bailliere Paris and London.

Massy, A. L., 1917. The gymnosomatous Pteropoda of the coast of Ireland. Sci. Proc. R. Dublin Soc. (NS) 15(12): 223-224, 1 tab., 6 figs, pl. 8.

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

Morton, J. E., 1957b. Opisthobranch Mollusca, Gymnosomata, families: Pneumodermatidae, Cliopsidae. Fiches; Cons. intern. Explor. Mer, Zooplankton-sheet 79: 1-4, 5 figs.

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.

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.

Pelseneer, P., 1885. The cephalic appendages of the gymnosomatous Pteropoda, and especially of Clione Quart. J. Microsc. (ns)25(5): 491-509, pl. 35.

Pruvot-Fol, A., 1924a. Étude de quelques gymnosomes méditerranéens des pêches de 'l'Orvet' en 1921 et 1922. Arch. Zool. Exp. Gén. 62(6): 345-400, 32 figs, pls 15-16.

Pruvot-Fol, A., 1926. Mollusques ptéropodes gymnosomes provenant des campagnes du Prince Albert Ier de Monaco. Résult. Camp. Sci. accompl. sur son yacht par Albert Ier 70: 1-60, 3 pls.

Pruvot-Fol, A., 1932. Note sur quelques gimnosomes de provenances diverses et diagnose d'un genre nouveau Arch. Zool. expér. gén. 74 (vol. jub.): 507-529, 18 figs, pl. 3.

Pruvot-Fol, A., 1934a. Faune et flore de la Méditerranée. Gastropoda- Opisthobranchia- Gymnosomata. Comm. Intern. Expl. Sci. Mer Méditerr.: 6 p. (not numbered)

Pruvot-Fol, A., 1942. Les gymnosomes.I . Dana Rep. 4 (20): 1-54, 77 figs.

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

Schalk, P. H. and Spoel, S. van der, 1988. Disobeying biogeographic laws: on the shallow occurence of deep-sea medusae and other organisms in the Indonesian waters. Plankt. Newsl. 8: 4-6.

Starobogatov, J. I., 1971. Ordo Thecosomata; ordo Gymnosomata; ordo Heteropoda. In: Polevoy Zool. Inst. Akad. Moscou. opredeliteli planktona (without page or figure numbers, not bound, mimiographed). [in Russsian]

Tesch, J. J., 1913c. Mollusca, Pteropoda. In: F. E. Schulze. Das Tierreich. Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen 36. Berlin (Friedberger and Sohn): i-xvi, 1-154, 108 figs.

Tesch, J. J., 1950a. The Gymnosomata. 2. Dana Rep. 6(36): 1-55, 37 figs.

Troschel, F. H., 1854. Beiträge zur Kenntniss der Pteropoden. Arch. Naturgeschichte 20(1): 196-241, pls 8-10.

Spoel, S. van der and Boltovskoy, D., 1981. Pteropoda. In: Boltovskoy, D. (ed.). Atlas del zooplancton del Atlantico Sudoccidental. Publ. INIDEP Argentina: 493-512.

Spoel, S. van der and Schalk, P. H., 1988. Unique deviations in depth distribution of deep-sea forms. Deep Sea Res. 35 (7): 1185-1193.

Spoel, S. van der, Boltovskoy, D. and Jankivich, S. S., 1981. Classification y distribucion. In: Boltovskoy, D. (ed.). Atlas del zooplancton del Atlantico Sudoccidental. Publ. INIDEP Argentina: 512-524.

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, 1971d. The pelagic Mollusca from the "Atlantide" and "Galathea" Expeditions collected in the East Atlantic. Atlantide Rep. 11: 99-139.

Spoel, S. van der, 1972a. A taxonomic outline of the Gymnosomata (Mollusca). Basteria 36 (2-5): 75-88.

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, 1976c. Pseudothecosomata, Gymnosomata and Heteropoda. Bohn, Scheltema & Holkema, Utrecht. 484 pp. 246 figs.

Spoel, S. van der, 1981a. Descripcion de los conchas embrionarias de Cavoliniidae. In: Boltovskoy, D. (ed.). Atlas del zooplancton del Atlantico Sudoccidental. Publ. INIDEP Argentina: 525-531.

Cliopsis krohni krohni