1884.] NATURAL SCIENCES OF PHILADELPHIA. Ill 



Locality. — Eocene sand from Claiborne, Ala. 



Remarks. — One specimen, the outer lip of which is not quite 

 perfect. 



An allied form seems to be Bulla Horyii Gabb, of Fort Tejon, 

 Cal. (Gabb, Paleontology of California, vol. i, 1864, p. 143 [non 

 p. 140], tab. 29, fig. 235), but this species is larger, thin, has no 

 callus and seems to differ besides in form and sculpture. Gabb 

 says : " Surface marked by numerous, very fine, impressed re- 

 volving lines." 



Very similar is Bulla omdata Lam. (Deshayes, Coq. foss. des 

 env. de Paris, vol. ii, p. 39, tab. 5, fig. 13, 14, 15), but without 

 callus. 



Bulla siibspissa Conr. (Proe. Ac. Philad., vol. iii, 1846, p. 20, 

 tab. 1, fig. 29) from the Miocene of Calvert CliflTs, Md., seems to 

 be of smootli surface; at least Conrad does not say anything 

 about sculpture. 



I cannot give the differences from Bulla petrosa Conr. {Am. 

 Journ. Sc. a. Arts, vol. ii, 2d series, 1846, p. 399), as Conrad's full 

 .description of this shell is the following : — 



" Bulla jyetrosa.—^Oyal, destitute of striae ?, summit oblique." 



GASTEROPODA. 



Cadalus depressue (nov. sp.). 



Smooth, shining, gently curved, inflation not very prominent. 

 Section everywhere an oval, one side of 

 which is a little flatter than the otlier. 

 Both ends oblique. 



Length, 7 mm. 



Locality. — Eocene sand from Claiborne, 

 Ala. ■ I I O 



Remarks. — The aperture of the figured 

 specimen is not pei'fect, but I know that 

 it is of the form indicated in the figure, 

 from other specimens. I have seen alto- 

 gether about a dozen specimens, and all 

 are everywhere of the same oval section. 



There are to be compared three North 

 American species of Cadulus : — 



1. Gadus pusillus Gabb, of the Tejon group, Martinez, Cal. 

 [Cretaceous or Tertiary ?] (Gabb, Paleont. of Cal., vol. i, 1864, 

 p. 139, tab. 21, fig. 99). Gabb says : " section circular." 



