The reproductive systems of the nudibranchia (Gastropoda, Opisthobranchia): Comparative histology and ultrastructure of the nidamental glands with aspects of functional morphology

The histology and ultrastructure of the nidamental glands (glandular oviduc t) of 11 species of Nudibranchia are described and compared. Conclusions ab out functional morphology can be drawn from examination of animals preserve d during the process of spawning. Generally speaking, all investigated spec ies possess three structurally and functionally different parts in the nida mental glandular system. The proximal capsule gland forms an inner albumino us layer in the egg capsules, the following membrane gland builts the membr ane around the embryo and the albuminous layer and in the distal mucous gla nd different mucus layers forming the spawn ribbon are successively added.