132 
MOLLUSCOUS ANIMALS. 
best character, and they have much more resemblance to the Ancillaria, for they have no distinct eyes, nor any 
tentacles, without the two perpendicular plates on each side of the mouth are to be considered in this light. 
Its foot is large and dilated, with a flap on each side in front ; the front lobe has a longitudinal slit in 
front, and is separated from the rest by a cross groove on each side, even with the front edge of the flat and 
opposite to the hinder edge of the callous band placed on the front of the last whorl of the shell. The respi- 
ratory tube is very long; and the male organ is elongated, compressed, bent back when contracted, and 
furnished with a sub-posterior inferior conical process. 
Agaronia hiatula. 
Oliva hiatula. Lain. Hist. vii. 435. 
Inhab. South America. 
This shell differs from the Olives in the belt across the front of the shell being much broader than in 
most of the species of that genus, and in the shell under the belt being deeply spirally grooved, bearing slight 
notches on the front of the edge of the outer lip. 
ANCILLARIA. 
The animals have a very large foot, into which the base of the shell is immersed ; it is truncated and 
extended behind. The mantle is thin, small, not in the least expanded beyond the edge of the shell, with a 
long subulate siphon. The tentacles are very short, and the trunk is cylindrical. The operculum is small, 
ovate, thin, with a nearly central nucleus and placed high up the middle of the back of the foot. 
According to the observation of M. Quoy they have the same habits as the Olives; they secrete abundance 
of mucus. They differ from the Olives in the small size of the tentacles, and in having no throat-like process 
to the back angle of the mantle. 
CYPRiEA. 
The young shell most resembles the shell of Bullina in general form, but they are easily distinguished 
from them by the inner lip not being thickened nor elevated. 
The young shell of most of the species of this genus is smooth, but the young of C. pustulata is covered 
with regular spiral and rather flat topped concentric ridges with equally wide grooves between them. The 
young shells have generally thin lips, but sometimes they become thickened ; thus, in a rather solid young 
specimen of the small variety of C. cervina there is a rather sharp raised ridge round the inner part of the 
outer lip which is very sharp, compressed, and strongly denticulated in front. 
The nucleus of the C. nigropunctata (which is only to be seen in the young shell) is finely concentrically 
and spirally ridged, so as to be closely and acutely cancellated. 
The animal of C. Arabica is black brown, with a yellow edge to the foot ; C. carneola red, white dotted ; 
C. felina pale, black dotted ; C. Talpa black, with small white spots ? C. Caput serpentis brown, covered with 
green, and the tentacula red spotted. 
CyPRyEA Mauritiana. 
The front of the foot truncated, grooved across the edge ; the penis rather large, conical, acute, grooved, 
the groove along the anterior side. 
Cypr^ea Lynx. 
The tentacles are subulate, far apart, on each side of a large trunk ; eyes on small tubercles at the outer 
base; the foot simple, folded longitudinally; the lobes of the mantles with tufts of minute filaments. 
