290 

 TEREBELLUM. 



BULLA TEREBELLUM. LilllUBUS. 



Sowerhys Genera, No. S, pi. 6. 

 It may be conjectured that all the univalve shells, 

 whose characters puzzled Linnaeus in their classifica- 

 tion, were placed by him in the G. Bulla, as a provi- 

 sional receptacle for them: thus the Terebellum, which 

 he did not characterize as a distinct genus, the Ovula, 

 Bulla, (properly so called,) Achatina, and some species 

 of Pyrulse, notwithstanding the disparity of such an 

 association, were all blended together. The G. Te- 

 rebellum is a convolute shell ; the whorls evolved on 

 their own axis; the right side plain and sharp, in the 

 form of an elongated cone, nearly cylindrical, and point- 

 ed at the summit ; the back part of the base irregular- 

 ly notched; aperture longitudinal, contracted at the up- 

 per part, very wide at the base; columella smooth and 

 truncated at the base; substance thin. Their charac- 

 ters ally them to the Ancillaria, Oliva, and Conus; 

 the Cypraea also in its first stage of growth slightly re- 

 sembles it. 



Terebellum subulatum. 



[And two fossil species.] 



