EULLEANA. MOLLUSCA. BULLA. 163 



Carolina, and accord with Mr. Say's solitaria ; and those from Rox- 

 bury are precisely Hke those found by Colonel Totten at Newport, 

 Rhode Island, and described by him. The observable differences are, 

 that the first are of a more dead white, are more cylindrical, the sum- 

 mit has a more square appearance, the revolving lines are less distinct, 

 and there is always a perceptible opening in the region of the spire. 

 These differences may be ascribed to age or. locality. I have used 

 Colonel Totten's name, since I am not sure that it is the shell intended 

 by Mr. Say. 



Bulla hiema'lis. 



Shell minute, globular^ very thin^ dusky, no spire perceptible, 

 with a small umbilicus. 



Figure 100. 



State Coll., No. 119. Soc. Cab. No. 2385. 



Bulla hiem^lis, Couthouv ; Bost. Journ. Nat. Hist., ii. 180, pi. 4, f. 5. 



Shell globular, very thin and brittle, transparent, of a brownish 

 tinge, except near the tip where it is whitish ; body-whorl envel- 

 oping all the rest, so as to leave no perceptible spire, and marked 

 with the lines of growth ; the aperture is narrow behind, but 

 greatly enlarged forwards ; the outer lip revolves, from its 

 junction behind, nearly a third of a revolution before it turns 

 forwards ; a thin plate of callus is spread over the inner margin, 

 and rises so as to form a small but distinct umbilicus. Length 

 and breadth about -y^y inch. 



Procured from cod-fish taken oft' Provincetown, in about thirty 

 fathoms water. 



It is a remarkable shell, sufficiently distinguished by its globular 

 form, and its peculiar lip. 



Bulla Gou'ldii. 



Shell ovate, ivhite, rather opaque, composed of four whorls, the 

 last including all the others, and covered tvith minute revolving 

 lines ; sjnre nearly flat. 



Figure 94. . 



