46 CRETACEOUS GROUP 
I have much pleasure in dedicating this only known 
American species of Nummulites, to one of the most ar- 
dent and successful cultivators of geological: science, 
Gideon Mantell, Esq., of Brighton, England. 
GASTEROPODA. 
Buia. 
1. Casts not very unlike B. Aignaria. From New 
Jersey. 
2. A solitary cast of a large, ventricose species, was 
found by Mr. Conrad in Alabama. 
Trocuus. 
1. T, leprosus, (S. G. M.) pl. xy. fig. 6. 
Specific character. Compressed; spire composed of about 
four volutions, presenting an unequal, rugged surface. 
Diameter, from an inch to an inch and a half. 
From Prairie Bluff, Alabama. T. A. Conrad. 
This species has considerable resemblance to T. ag- 
glutinans, a recent shell of the West Indies. 
2. I have observed some casts of this genus in the cal- 
careous strata of New Jersey. 
DELPHINULA. 
2. D. lapidosa, (S. G. M.) pl. xix, fig. 7. 
Specific character. Shell discoidal, with about three volu- 
tions; shoulder angulated; margin flattened; umbilicus pro- | 
foundly patulous ; spire slightly elevated above the body whorl. . 
From Prairie Bluff, Alabama. | 
