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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.

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.

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.

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.

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., 1963. Geographical variation in Limacina helicina in the North Pacific. Syst. Assoc. Publ. 5 (Speciation in the sea): 109-128, 14 figs.

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

Pierrot-Bults, A. C. and Spoel, S. van der, 1979a. Speciation in macrozooplankton. In: Spoel, S. van der and Pierrot-Bults, A. C. (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 144-167.

Soutar, A., 1971. Micropalaeontology of anaerobic sediments and the California Current. In: Funnell, B. M. and Riedel, W. R. (eds.). The micropalaeontology of oceans. Cambridge (University Press): 223-230, figs 13. 1-13. 5.

Tesch, J. J., 1948. The thecosomatous pteropods, 2. The Indo-Pacific. Dana Report 30: 1-45, 34 figs, 3 pls.

Spoel, S. van der and Heyman, R. P., 1983. A comparative atlas of zooplankton. Biological patterns in the oceans. Bunge, Utrecht; Springer Verl., Berlin: 1-186.

Spoel, S. van der and Pierrot-Bults, A. C., 1979. Zoogeography of the Pacific Ocean. In: S. van der Spoel and A. C. Pierrot-Bults (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 293-327.

Spoel, S. van der, 1967. Euthecosomata, a group with remarkable developmental stages (Gastropoda, Pteropoda). J. Noorduyn and Zn, Gorinchem, 375 pp.

Summary (in Dutch also published separately)

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

Spoel, S. van der, 1983b. Sur la répartition, la variation et la réproduction de quelques mollusques planctoniques (Ptéropodes). BIOMAR Univ. Bruxelles 2: 79-92.

Yamaji, I., 1991. Illustrations of the marine plankton of Japan. 3°Ed. Hoikusha Publ. Co. Ltd, Osaka.: 1-538.

Zhang, F., 1966. The pelagic mollusca of the China coast, II: on the ecology of the pelagic moluscs of the Yellow Sea and the East China Sea Oceanol. Limnol. Sinica 2(1): 13-28.

Limacina helicina helicina acuta