4. 
2. 
PLATE XVII. 
Scalaria. 
The female Vivipara taken out of its shell, and the branchial cavity 
opened. 
a. The foot folded in two. | h. The orifice of the womb. 
b. .. operculumattached toits | 7, part situated under the spire. 
posterior part. ; 
c. .. head, with the tentacula | @- -- @nUuS. - 
_and trunk. l. canal of viscous matter. 
d... nae aa i m. .. projecting line, forming a se- 
mea ao ee perros Po terminates 
‘e. .. lasveral membrane of the Bond ia A = 
left side. n. .. heart and its auricle. 
S- edge of the mantle. o. .. partsof the liver and intestine. 
g. .. branchie. 
A. womb swelled by the fe- 
tus within. 
Trochus. (Cochlea sublivida, Lis.) 
h. The head. p. The langueite. 
tt... tentacula. AP. &: feat: 
ee... -€Yes. 0. operculum. 
Do. seen underneath. 
J: The foot. | m. The mouth. 
. Animal of the Zrochus pharonius, taken out of its shell, with its oper- 
culum. 
Hoe Turbo littoreus. 
.9.10...  .. Turbo chrysostomus. 
Nerita canrena, takenzout of its shell. 
Nerita e2uvia, with its operculum. 
Trochus, Gualt. 
