GASTEROPODA. 309 
lose, curte, clavate, retractiles: cucullus cordiformis, amplus, arbus- 
culis ad decem utrinque fimbriatus: pes corpore lator, posticé crenu- 
latus. 
Body elongate, laterally compressed, moderately convex on the 
back, along the sides of which is a narrow, membranous expansion, 
just inside of which are disposed ten pairs of short, arborescent bran- 
chial tufts. The tentacles are short, stout, clavate, tubular, with an 
irregular fissure at tip, retractile into a sheath. Head prolonged into 
a frontal hood or veil projecting over the mouth, and having the centre 
emarginate ; each side of this hood is furnished with nine or ten arbores- 
cent processes or laciniations. The mouth is large, a transverse dupli- 
cation of the hood forming a lip full of wrinkles and short papille, 
capable of being drawn over the mouth; foot somewhat wider than the 
body, tapering posteriorly, and trifid at its extremity, with the middle 
lobe longest, margins sinuous. Anal orifice on a whitish tubercle just 
under the third branchial tuft. Genital orifice small, tubular, between 
the fourth and fifth branchial tufts. Colour above olive-green, mottled 
with dark reddish-brown and white; sides olive-green, with white 
specks ; foot uniform olive, margined with yellowish. [s. p. c.] 
Length two and a half inches; breadth half an inch. 
Found among Penei, in the market, Rio Janeiro. 
Figures 403, 403 a, lateral and ventral views of the animal; 403 6, 
mouth and hood, enlarged; 403, the tentacle, enlarged ; 403 d, open 
extremity of the tentacle ; 403 e, the penis, enlarged ; 403 /, transverse 
section of the body. 
Genus CHIOR A RA—(Goutp). 
Corpus limaciformis, caput enorme, pedunculatum, semiglobosum ; 
pagina ventral discoided; ore longitudinali, seriebus binis cirrhorum 
cincto: tentacule cephahce foliata, retractiles: lobi branchiales flabel- 
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