PHYLLIDIID^, 391 



kidney and pericardium, and with the vent on its right side ; sides 

 of the back produced in lateral wings, usually bent upwards ; 

 upper face of the back with parallel longitudinal folds ; foot not 

 distinctly separated from the rest of the body, transversely 

 bipartite in front. Only genus — 



Placobranohus, Hasselt. 

 Distr. — .9 sp. East Indies, Polynesia. P. ocellatus, Quoy 

 (xci, 41). 



Characters those of the subfamily. 



Subfamily LIMAPONTIIN^. 



Bodj^ slug-like, minute ; head depressed, its sides carinated or 

 produced into simple feelers ; eyes separated ; no dorsal wings ; 

 foot continuous ; pharynx as in Elysia ; plates of the radula 

 somewhat compressed, with a carinated hook; penis armed with 

 a sting. 



Limapontia, Johnston. 



Syn. — ^Chalidis, Quatref. Pontolimax, Cr. 



Distr. — Norway, England, and France, between half-tide and 

 high-water, feeding on Confervse, in the spring and summer ; 

 spawn in small pear-shaped masses, each with 50-150 eggs ; fry 

 with a transparent nautiloid shell, closed by an operculum. L. 

 csei'ulea^ Quatr. (xci, 42). 



Animal minute, leech-like ; head truncated in front, with arched 

 lateral ridges on which are the eyes ; foot linear. 



AcTEONiA, Quatrefages. 



Distr. — 2 sp. A. senestra^ Quatr. (xci, 43). 



Animal minute, leech-like ; head obtuse, with lateral crests 

 proceeding from two short conical tentacles, behind which are 

 the eyes. 



Cenia, Alder and Hancock. 



Syn. — Fucola, Quoy. 



Distr. — G. Gocksii (xci, 45). 



Animal limaciform, back elevated, head slightly angulated, 

 bearing two linear dorsal tentacles, with eyes at their outer 

 bases behind. 



Rhodope, Kolliker, 184'7. 



Distr. — B. Veranii. Upon algse, Messina. 



Animal minute, similar to Limapontia (?) ; worm-shaped, rather 

 convex above, flat beneath ; without mantle, gills or tentacles. 

 Probably not a mollusk. 



Family PHYLLIDIIDtE. 

 Branchiae covered or wanting. 



