CARINARIIDA. 349 
Frroia, Peron and Lesueur. 
Syn.—Pterotrachea, Forsk. Anops, d’Orb. 
Distr.—14 sp. Atlantic, Mediterranean, Pacific. /. Quoyana, 
d’Orb. (Ixxxvi, 97). 
Animal fusiform, elongated, with a long, slender, proboscidi- 
form head; fin narrowed at the base, usually furnished with a 
small sucker; tail elongated, keeled, sometimes pinnate; nucleus 
prominent; branchial processes numerous, conical, slender ; ten- 
tacles very short and conical; eyes black and distinct, protected 
by a rudimentary eyelid; lingual ribbon oblong. The female 
Firole have a long moniliform oviduct. Anops Peronit, 
d’Orbigny, described and figured as having no head (!), was 
probably a mutilated Firola. ‘Such specimens are very 
common, and seem just as lively as the rest.” —HuxLry. 
FIROLOIDES, Lesueur. (Cerophora, d’Orbigny.) Body cylin- 
drical; head tapering, furnished with two slender tentacles ; 
nucleus at the posterior extremity of the body, with or without 
small branchial filaments ; egg-tube regularly annulated ; tail- 
fin small and slender, ventral fin with or without a sucker. 
Distr.—6 sp. Atlantic, Mediterranean. F. Gaimardi, Orb. 
(Ixxxvi, 98). 
Famity CARINARIID #. 
Animal with pedunculated nucleus, covered by a glassy conical 
shell, from the margin of which project the branchiz. Dentition 
(xii, 42). 
CaRINARIA, Lam. 
Etym.— Carina, a keel. Syn.—Tithyonia, Cavolini. 
Distr.—8 sp. Tropical and subtropical seas. Fossil, 1 sp. 
Miocene; Turin. C. fragilis, Bory (Ixxxvi, 99). C@. vitrea, 
Lam. ‘1xxxvi, 100). 
Shell hyaline, symmetrical, limpet-shaped, with a posterior, 
subspiral apex and a fimbriated dorsal keel; nucleus minute, 
dextrally spiral. 
Animal (lxxxvi, 99) large, translucent, granulated ; head thick, 
eylindrical; lingual ribbon triangular, teeth increasing rapidly in 
size, from the front backwards; tentacles long and slender, eyes 
near their base; ventral fin rounded, broadly attached, with a 
small marginal sucker; tail large, laterally compressed; nucleus 
-pedunculated, covered by the shell, gills numerous, pinnate, 
projecting from beneath the shell. 
They feed on small Acalephz, and probably on the Pteropoda ; 
Mr. Wilton found in the stomach of a Carinaria two fragments 
of quartz rock, weighing together nearly three grains. The 
sucker on the fin of this and the preceding genus was formerly 
‘supposed to be characteristic of the male, but it has recently 
‘been fotind well-developed on female individuals. Mr. Arthur 
