OBSERVATIONS ON THE SPAWNING HABITS OF SOME OF THE JAPANESE OPISTHOBRANCHIA (I)

Abstract

The aim of this paper is to deal with the spawning habits of some of the Japanese Opisthobranchia as they are seen in the field as well as in the laboratory aquarium. Taking this opportunity, we wish to thank to Drs. Huzio UTINOMI and Takasi TOKIOKA whose kind permission enabled us to work at the Seto Marine Biological Laboratory, and to Dr. Masao SUGIYAMA who has allowed us to use the equipments of the Sugashima Marine Biological Laboratory for our study. Parts of the observations were also carried out at our University laboratory, the fresh material of the opisthobranchs being brought back from the various parts of the Osaka Bay. The present study was commenced in the winter of 1950.