45 
TURBO conic us. 
TAB. CCCCXXX11L— 1. 
Spec. Char. Ovato-conical, acute, ijmbilicated, 
transversely striated ; whorls very convex ; 
base rounded. 
The whorls, six in number, are so convex that they are 
almost depressed upon their upper parts ; that last 
formed is considerably larger than the preceding ones 
the apex is remarkably acute ; the striae are small and 
very numerous. In its general form this shell much re- 
sembles the Turbo tenebrosus of our shores, but differs 
in being sharply striated, and also in having an umbilicus 
which does not commonly occur in the Genus Turbo. 
There are several recent Foreign species somewhat re- 
sembling it, but they want the umbilicus and have much 
less ventricose whorls. Not unfrequently met with, re- 
placed by Silex, in the Green-sand Formation. 
TURBO rotundatus* 
TAB. CCCCXXXIII .—fig. 2. 
Spec. Char. Ovate, subglobose, pointed, urn- 
hi Heated, smooth ; aperture rather pointed 
above, large. 
A smooth roundness of contour characterizes this shell ; 
the aperture is equal to half the length of it, and is 
longer than wide ; the spire is short and pointed. 
Found with the above at Rlackdown, but more rare. 
The elongated form of the aperture in this species and 
the umbilicus together, present a considerable analogy 
to those fossils of the London Clay formation that have 
