298 MOLLUSCA., 
for the ruffled margin posterior to them, and especially for the pecu- 
liar form of the plumules, lke the leaves of Acanthus. 
Figures 392, 392 a, dorsal and ventral views of the animal; 3924, 
lateral view in outline. 
Doris CEREBRALIS (Gould). 
D. grandis, elongata, ovoidea, retrorsum angustata, dorsuosa, ex olivaceo 
flavescens: tentacule cervicales recurve, capite laminato, conico; 
labiales subulate, citrine: stella branchialis magna, plumuls sex 
foliatis, bipinnatifidis, acanthiformis: tubus analis curtus, pinnis 
coronatus: pes angustus, brevis: pallium flavo-marginatum, rufo-pur- 
pureo nubeculatum. 
Anima large, elongated ovoid, widest anteriorly, tough and rigid, 
and raised into ridges somewhat like the convolutions of the brain ; 
there is a longitudinal range of these ridges on each side of the median 
line from the tentacles to the branchisw, with lateral branches like 
stomachs of the leech, and they also form ranges of concentric undu- 
lations near the margin. Colour olivaceous with yellowish shadings, 
darker in the depressions ; beneath, the edge of the mantle is bright 
yellow, then purple-brown. Cervical tentacles recurved, horn-shaped, 
the laminated portion obliquely conical, yellowish-brown ; labial ten- 
tacles lemon-coloured, subulate. Branchial star large, nearly as wide 
as the body; plumules six, brownish, broadly expanded, doubly pin- 
pate, the primary clefts, three on each side, not extending to the 
rachis, the folioles crenate. Anal tube short, the summit crowned as 
with battlements ; foot narrow, not reaching to either extremity of the 
body, cream-coloured along the centre. Head small, concealed under 
the mantle. 
Length five inches ; breadth two and three-fourths inches; width of 
the foot an inch and a quarter. 
Taken from a reef in Sandalwood Bay, Feejee Islands. 
The motions of this animal are noted as being “very slow.” The 
