45 



TURBO conicus. 



TAB. CCCCXXXUI.— 7%^. 1. 



Spec. Char. Ovato-conical, acute, umbilicated, 

 transversely striated ; whorls very convex ; 

 base rounded. 



X HE 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 stride 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 mucli 

 less ventricose whorls. Not unfrequently met with, re- 

 placed by Silex, in the Green-sand Formation. 



TURBO rotundatus, 



TAB. CCCCXXXIII.— ^^. 2. 



Spec. Char. Ovate, subglobose, pointed, um- 

 bilicated, 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 Blackdown, 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 



