PHYLLIDIIDA. 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 
distinetly separated from the rest of the body, transversely 
bipartite in front. Only genus— 
PLACOBRANCHUS, Hasselt. 
Distr.—9 sp. East Indies, Polynesia. P. ocellatus, Quoy 
(cel), 41). 
Characters those of the subfamily. 
SuspraMity LIMAPONTIIN 2. 
Body 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 Conferve, 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. 
cerulea, 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. 
CentA, Alder and Hancock. 
Syn.—Fucola, Quoy. 
Distr.—C. Cocksti (xci, 45). 
Animal limaciform, back elevated, head slightly angulated, 
bearing two linear dorsal tentacles, with eyes at their outer 
bases behind. 
Ruoporg, Kolliker, 1847. 
Distr.—k. Veranit. Upon alge, Messina. 
Animal minute, similar to Limapontia (7); worm-shaped, rather 
convex above, flat beneath; without mantle, gills or tentacles. 
Probably not a mollusk. 
Famity PHY LLIDIIDA. 
~~ Branchiew covered or wanting. 
