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132
be st character, a nd they h ave much more resemblance to th e Anc illa ría , for they have no distin c t eyes, nor any
tentacles, without the two perpendicula r plates on each side o f the mouth are to be considered in this light.
I ts foot is large and dilated, with a flap on each side in fro n t; the front lobe has a longitudinal slit in
front, and is separated from the rest by a cross groove o n each side, even with the front edge o f the flat and
o pposite to the hinder edge o f the callous band placed on the front of the last whorl o f the shell. The respiratory
tube is very lo n g ; and th e male organ is elongated, compressed, bent back when contracted, and
furnished with a sub-posterior inferior conical process,
A g a r o n i a h i a t u l a .
Oliva hiatula. Lam. Hist. vii. 435.
In h ab . South America.
Tliis shell differs from the Olives in the b e lt across the front o f the shell being much broader than in
most o f the species o f tha t genus, and in the shell unde r the belt being deeply spirally grooved, bearing slight
notches on the front of the edge of the o ute r lip.
A N C IL LA R IA .
T he animals have a very large foot, into which the base o f the shell is im m e rsed; it is truncated and
extended behind. The mantle is thin, small, not in the least expanded beyond the edge o f the shell, with a
long subulate siphon. The tentacles are very short, and the tru n k is cylindrical. The operculum is small,
ovate, thin, with a nearly central nucleus and placed high u p the middle o f the back o f the foot.
According to the observation o f M . Quoy they have the same habits as the Olives; they secrete abundance
o f mucus. They differ from the Olives in the small size o f the tentacles, and in having no throat-like process
to the back angle o f the mantle.
C Y PRÆ A .
The young shell most resembles th e shell o f B u llin a in general form, b ut they are easily distinguished
from them by the inne r lip n ot being thickened nor elevated.
The young shell o f most of the species o f this genus is smooth, b u t th e young o f C. p u s tu la ta is covered
with regular spira l an d rather flat topped concentric ridges with equally wide grooves between them. The
young shells have generally thin lips, b u t sometimes they become thickened ; thus, in a rather solid young
specimen o f the small variety o f C. cervina there is a rather sharp raised ridge round the inner p a rt of the
outer lip which is very sharp, compressed, and strongly denticulated in front.
The n ucleus o f the C. nigropunctata (which is only to be seen in the young shell) is finely concentrically
and spirally ridged, so as to b e closely and acutely cancellated.
T h e animal of C. Arabica is black brown, with a yellow edge to the foot ; C. carneóla red, white dotted ;
C. f e l in a pale, black dotted ; C. Ta lp a black, with small w hite spots ? C. Caput serpentis brown, covered with
green, and the tentacula red s
C Y P R .E A M a u r i t i a n a .
T he front o f the foot truncated, grooved across the e d g e ; the penis rather large, conical, acute, grooved,
the groove along the anterior side.
C y p r j EA L y n x .
The tentacles are subulate, f a rap a rt, on each side of a large tru n k ; eyes on small tubercles a t the outer
b a se ; the foot simple, folded longitudina lly; the lobes of the mantles w ith tufts o f minute filaments.
In a young specimen, the mouth o f which was n ot formed, the mantle on the pilla r side was d ila ted, with
a lobe covered with processes, and the outer side w as simple with a slightly thickened edge.
C y p r ^ a s p u r c a . Var. t. 3 4 . / . 6 , 7 .
This shell sometimes instead o f having the usual mouth has a wide irregula r s c arcely toothed one, and the
base and lips are p urple brown, while in the common state they are yellowish. I have seen some shells in an
intermediate state, and therefore have no do u b t o f its being a variety o f this species. When I first described
it, I thought it might be a variety o f C. erosa with the lateral spot suffused over the base, b u t this does n ot
prove to be the case.
C v P R iE A A N N U L U S .
T h e lobes o f the mantle are covered with numerous papillae.
OVULA.
O V U LA TU B E R CU LO SA .— L a w .
The animal like the Cowry ; the tentacles rather b lu n t; mantle edges reflexed, smooth, with small oval
brown dots. Foot large, crumpled on the sides, pale brown, black d o tte d ; the penis large, low down.
ERA TO ,
The ad u lt animal, like the C owries, when alive extends a thin, membraneous, beautifully speckled mantle
over the shell— the mantle is not extended in the young state.
Most conchologists have confounded it witli M a rg in e lla ; though M ontagu, who was one of the first
describers of the shell, refers it to its most natural situation amongst the Linn®an genera.
CORIOCELLA.
C o r i o c e l l a n i g r a .—Blain.
Sigaretus.—Cuv. Ann. Mus. Anat.
Grows to a large size. T h e shells are the large Sigaret of English C ab in e ts ; they are green when
fresh and soon become w h ite ; the foot is n ot one-fourlh the size of the mantle ; the penis is large, on the right
s id e ; the trunk is long, like tha t of Buccinum. The tentacles depressed, close together, united on the inner
side over the top o f the hole of the trunk, withthe eyes near the extremities; the penis is very long, subulate,
a c u te ; operculum none. The canal of the mantle is very distinct, and lined with a cartilaginous skin.
Lamarck referred the description and anatomy o f this animal to his genus Si g aretus, and thus his character
consists o f the animal o f this and the shell o f tha t genus.J
V OLUTA.
Mantle small, thin, n ot extended beyond the margin of the shell, with a rather short thick open respiratory
canal, furnished with a subulate ear-like lobe or process on each side of its base. The tentacles short, conical,
far apart, with theeyes on their outer b ase, and behind them is placed along the side of the head a semicircular
lobe. The trunk rather thick, conical; the foot large, folded longitudinally when contracted ; the male organ
is large with a conical reflected tip ; operculum none.
The respiratory canal o f this genus witlrits two lobes a t its base may easily be mistaken for a t ru n k with
its two tentacles. In some species the tentacles are placed on a semilunar hood from unde r which the tru n k
a rise s; and the eyes are sometimes rather behind the base o f the tentacles, and the tentacles are sometimes
nearer the margin than a t others.