2ig- 



tHe (hell : the (Icin is warty, tough, and of a dufky-brown- 

 colour. The gizzard or ftomach is a very fingular ftruc- 

 ture: it is fmall in proportion, and confifts of three fub- 

 oval, corneous plates, held together at their edges by liga- 

 ments, and furrounded by a ftrong, cartilaginous, or muf- 

 cular fubftance : it is of a fub-triangular fhape, with the 

 alimentary canal attached to its centre. The plates on 

 the infide are well formed for comminuting its food : 

 thev are of a dark purplifh-brown, or chocolate colour, 

 with a longitudinal ridire, and feveral tranfverfe furrows 

 on each ; the upper parts refletf outward, and are bare of 

 covering even when connecled together, fo that their 

 flrufture is partly feen without opening the ftomach : the 

 lower part of the gizzard is convex and mufcular. 



To a conchologift, perhaps, it would be difficult to de- 

 fcribe the appearance of the corneous organs of digeftion 

 better, than by faying they refemble fo many fmall ChiLons. 



11. 

 Bulla Akera. Gmel. Syji. p. 3434. Akkra. 



Turt. Lin. iv. p. 358. 

 Bulla foluta parva. Chem. Co/zc/z. x. t. 146. f.l358.No.l.2.3. 

 Bulla foluta magna. Id. x. t. 146. f 1359. 1361? 

 Bulla foluta. Gmcl. Syft. p. 3434. 43 ? 



Turt. Lin Iv. p. 358. 

 Bulla reGliens. Don Br. Shells, in. t. 79. 



B. with an extremely thin, pellucid, horn-coloured 

 ftiell, of an elaftic nature : fliape oval, fomewhat wrinkl- 



F f 2 ^"^ 



