208 



4. 

 Aperta. Bulla aperta. Lin. Syft. p. llSS.—Gmel Syft. p. 3424. S. 



Martini Conch, i. p. 266 vig. 13. f. 3. 

 Chan. Conch, x. t. 146. f. 1354. 1355. 

 Piih. Cat. Dorfet. p. 40. 

 Ti/rt. Lin. iv. p. 350.— Gmlt. t. 13. E. E. 

 Don Br. Shells, iv. t. 120. f. 1. 1. 

 Bulla, the Bubble, Da Cojia, p. 30. t. 2. f. 3. 



B. with a fub-orblcular, thin, pellucid, brittle, white 

 fnell : no external convolution or t/m/^z/zcz^j; Columella, 

 or rather inner lip, very fmall, (lightly involuted, vifible 

 to the end: the aperture occupies nearly the whole of the 

 fhell: the outfide is a little wrinkled, but glolTy. 



This fpecies has generally been confidercd as rare on 

 our fhores: Da Costa was the firft who gave it as En- 

 glijli, and fays it is fiflied up at Weymouth ; and no where 

 elfe, to his knowledge, on the BriliJJi coaft. 



That author, however, feems to have confounded the 

 B. aperta with the E. patula of Pennant, (which as yet 

 we believe has only been found on the DorfcfJJiire coall.) 

 as he has quoted that fliell for this ; whereas this fpecies 

 is not mentioned in the BritiJJi Zoology ; nor was that 

 (hell known to Da Costa. Gmelin and CrtEMNiTZ 

 Jiave followed Da Costa's error. 



Its ufual fize does not much exceed half an inch in 

 length : but on the north coaft of Devon, about Biddeford 

 bav (where it is extremely plentiful) it is no uncommon 



thinff 



