On a new genus of Nudibranchiata. Fam. Elysiadae

The Elysiadse are shelless mollusca with no distinct mantle or respiratory organ, all being performed by the ciliated surface of the body. The stomach is central; the hepatic organ branched, extending almost the whole length of the animal; eyes sessile, and tentacles simple or obsolete.
There are five known genera of the family, viz.: — Elysia, with tentacles; Actaeonia, leech-like and with tentacles; Genia leech-like, linear dorsal tentacles; Limapontia, head truncated and with arched lateral ridges; Rhodope, wormlike.
To this family I have found an addition of marked and peculiar generic character. This new genus I propose to dedicate to Mr. Morton Allport, as a slight mark of appreciation of his great services to science and acclimatization in Tasmania