III. Preliminary note on embryonic fission in Lichenopora

Abstract

I have shown on a previous occasion that the primary embryo of Crisia gives rise to numerous larvæ by a constantly repeated process of embryonic fission, and I have suggested the probability that this method of development will be found to be characteristic of Cyclostomatous Polyzoa in general. Observations recently made on Lichenopora verrucaria, Fabr., obtained on the coast of Norway, have enabled me to prove the occurrence of embryonic fission in a second genus of Cyclostomata, although the details of the development are remarkably different from those of Crisia.