223 



We found this fpecies, fparingly, amongfl; fand from 

 Falmouth, harbour. 



14. 

 Bulla truncata. Lin Trans, v. t.l.f 1.2. (Adams.) Truncata. 



Turt. Lin. iv- p. 358. Tab. 7. f. 5„ 



B. with a fub-cylindric, opaque, white fliell ; the 

 upper part longitudinally ftriated, the lower plain : apex 

 truncated, and largely umbilicated, fhewing the involuti- 

 ons : aperture the whole length, extremely narrow, but 

 dilated a little at tlie bafe, and contrafted moft in the 

 middle. 



This (liell has fomewhat the habit of the laft, and of the 

 fame fize; but differs in being truncated at the top, in 

 the involutions bemg confpicuous within the umbilicus, 

 and in being partly ftriated. We found this not uncom- 

 mon in fand at Falmouth; rare from Salcomb bay, Devon- 

 Jliire, and Weymouth. 



Worn fhells are fometimes deftitute of ftriae. 



Not B. truncata of Gmelin. 



15. 



Bulla crafla, apertura medio coarctata. Walk. Min. Shells, f.62. Obtusa. 

 Bulla Regulbienfis. Turt. Lin. \w p 3 'Si. Tab. 7. f. 3. 



Adams. Microfc. t. 14. f. 28. . -, 



B. with 



