228 CACIDA. 
Torinia, composed of a spiral band ciliated at the margin, forming 
a cylinder or cone, the axis of which is filled up by a series of 
spiral radiating cells. 
PYXIPOMA, Mirch, 1860. Slt closed by a lamella, but not filled 
up outside. S. lacteus, Lam. Australia. 
AGATHIRSES, Montf., 1810. The band composed of numerous 
isolated holes. Chiefly fossil. S$. squamosa, Lam. 
ORYPTOBIA, Desh. Proposed for a tubular shell, with spiral 
commencement, formerly supposed to be constructed by an 
annelid. It is believed to be related to Pyxipoma by Morch, 
but its true nature is by no means clearly established. S. 
Michelini, Desh. Isle of Bourbon, 
Famity CACID &. 
Shell with a fugatious spiral nucleus; tubular, regular, minute. 
Operculum horny, multispiral, margin sometimes fimbriated. 
Animal. Lingual membrane short; teeth in two series (2°0°2), 
central denticles none, the lateral uncini with the inner one 
broad and serrulated. Rostrum long and flat; tentacles short, 
subclavate at the tips; eyes sessile behind the bases of the 
tentacles. Mantle thick, fleshy, circular, closely embracing the 
neck; a single branchial plume. Foot short, narrow, truncate in 
front, obtuse behind. Not at all shy, progressing with great 
vivacity. 
Czcum, Fleming. 
Syn.—Anellum, Carp. Cecalium, Macg. Odontidium, Phil. 
Fartulum and Elephantulum, Carp. Brochina, Gray. Corni- 
culina, Munster. Brochus, Browne. Odontina, Zborzewsky. 
Dentaliopsis, Clark. Odontidium, Phil. 
Distr.—42 sp. Europe, United States, West Indies, Mazatlan, 
Australia, Japan, Mauritius. Fossil, 8 sp. Eocene—. (C. cor- 
nuotdes (Ixvii, 81). C. pulchellum, (1xvii, 82). 
Young shell spiral in one plane, afterwards an arcuated tube, 
truncated posteriorly by the loss of the spiral portion, and closed 
there by a convex septum. 
P. P. Carpenter proposed subgenera for species distinguished 
by differences of sculpture, but M. de Folin, who has recently 
studied the Ceecide, points out that these groups are not founded 
on permanent characters, the various species exhibiting a series 
from smooth to ribbed surfaces. 
BROCHINA, Gray. Founded on a single species, and insuffi- 
ciently characterized by its convex operculum. 
MIOCERAS, Carpenter, 1858. Young shell loosely spiral, not in 
one plane; adult shell somewhat inflated, aperture oblique ; oper- 
culum externally concave. The species are all smooth, the 
adult resembling in shape the horn of an ox. C. cornucopie, 
Carp. 
