87 
VOLUTA. 
A. Aperture entire. (Plate XV. Fig. 1.) 
B. Subcylindrical, emarginate. (Fig. 2.) 
C. Oval, effuse, emarginate. (Fig. 3.) 
D. Fusiform. (Fig. 4.) 
E. Ventricose, spire papillary at the tip. (Fig. 6.) 
Shell univalve, convolute. Aperture not elon- 
gated, subeffuse. Columella plaited, without either 
lip or umbilicus. 
Although this genus contain many apparently 
incongruous shells, yet as it stands in the Linnsean 
arrangement it is more easily discriminated than 
almost any other, because all shells are referred to 
it which possess the plaited columella, except a 
few, which from evident and strong analogy are 
to be attached to some other genus. The plaits 
in the columella, which vary in number, but are 
never very numerous, may be easily distinguished 
from the teeth of a Cypreea ; these last being uni- 
formly placed on a thickened columellar lip, and 
having corresponding dentations on the outer 
