GASTEROPODA OF THE EOCENE MARLS. 223 
terize the immature shell, or others where the coating has been removed, is 
distinctly shown. Quite a number of examples have been studied, and no 
feature appears by which to distinguish it from the typical specimens of the 
species. 
Formation and locality: In the upper layers of the Upper Green Marls, 
at Shark River, New Jersey. Collection at Rutgers College. 
CYPRAIDZ. 
Genus CYPRA Linnezus. 
CYPR2ZA SABULOVIRIDIS, n. sp. 
Plate xxx, Figs. 20-22. 
Casts of a species of Cyprea occur in the collection in use, but not 
numerously. The species has been a small one with but few pronounced 
features, and of these of course only the general form will be retained on 
the internal casts. These remains are small, being but little more than 1 
inch in length; the form is strongly ovate and somewhat ‘‘humped” near 
the anterior end of the dorsal surface; anterior end of the cast distinetly 
but not largely umbilicated, and the posterior end obtusely pointed and 
suleated at the extremity; outer lip somewhat longer than the body of the 
cast, enrolled but not deeply so; a few rather strong crenulations can be 
distinguished upon it indicating teeth, and the entire surface of the cast is 
smooth; aperture quite narrow. 
Only one of the casts present shows the enrolling of the outer lip and 
the size and form of the aperture entire. The specimen ‘has been slightly 
compressed laterally, which may have somewhat exaggerated the “humped” 
appearance of the dorsal surface, though I think not to any great extent. 
Its form and size appear to have been somewhat like that of C. spheroides 
Conrad, from the Jackson group, of Mississippi, described and figured in 
Waile’s Geol. of Mississippi, but not near enough to be classed under the 
same specific name, considering the difference in position, while it is still 
further removed from C. Mortoni Gabb, of the Cretaceous Beds in New 
Jersey. 
