308 MOLLUSCA. 
Foot lake-red; back paler, with numerous fine, linear, longitudinal 
folds running the whole length. Head obtuse, with the hood forming 
a sort of mask before the tentacles, being detached above and on each 
side, where it is a little prolonged ; eyes at the outer base of the tenta- 
cles. Middle of the back gibbous; posterior extremity tapering to a 
fine point; the expanded mantle turns up on each side, but not suffi- 
ciently to completely cover the back. Motions extremely sluggish. 
Length an inch and a quarter. 
Obtained from a coral reef, Honolulu, Sandwich Islands. Pickering. 
Figures 406, 406 a, lateral and dorsal views. 
Enysia topata (Gould). 
Corpus limaciforme, gracile, dilatatum, trilobatum, virescens nigro-punc- 
tatum ; pallium utrinque flavo-marginatum : tentacule elongate. 
AnimaL slug-like, greenish, dotted with black and bordered with 
yellow; edge of the mantle expanded into a three-lobed lateral wing. 
Head small, with very large and long tentacles, tipped with sky-blue; 
eyes situated laterally, a little behind the tentacles. In creeping it 
flaps downwards, at pretty regular intervals, its long, ear-like tenta- 
cles. There are no apparent branchial organs, not even the plaits along 
the back, as in Placobranchus, to which it is otherwise evidently 
allied; the parts about the mouth seem to have been imperfectly 
figured. 
Length one inch. 
Found creeping on coral stems, like a small Doris, at Honolulu. 
Dr. Pickering. 
Figures 405, 405 a, lateral and dorsal views of the animal. 
TRITONIA CUCULLATA, (Couthouy MS.) 
T. oblonga, subquadrata, sub-alata, olivacea superné rufo et albo nebu- 
losa; arbusculis branchialibus curtis utrinque decem ; tentacule tubu- 
