218 COyCHYLlX—DITHYBA. 47. 



Tab. nost. 17, fig. 4, 5. 



Pecteji fragilis. Montagu, Test. Brit. Suppl. p. 62. 

 Pennant, Brit. Zool. iv. p. 223. 



Pecten bullatus. Chemnitz, vii. p. 348, tab. 68, fig. 649, b. 



Ostrea fasciata. Diflwyn, Descript. Catal. p. 269. 



Ostrea fragilis. Tnrton, Conch. Diet, p. 131. 



Mus. nost. Devonshire coast, and Bray in Ireland. 



Shell three quarters of an inch long, and barely half an inch 

 broad, very convex, and much curved outwards on one side, with 

 numerous raised longitudinal striae which are a little undulated, 

 with three or four lesser ones between each of them : the cardi- 

 nal margin rather oblique. 



subauricu 

 lata. 



Lima testa compressd suhcBquilaterali, striis longitudinalibus 

 1- rectis cequalibiis, auricuUs subrectilinearibus. 



Shell flattish and nearly equilateral, with longitudinal straight 



striae which have no lesser ones between them, and the auricles 



nearly rectilinear. 

 Pecten subauriculatus Montagu, Suppl. p. 63, tab. 29, fig. 2. 



Pennant, Brit. Zool. iv. p. 224. 

 Pecten fragilis. Chemnitz, vii. p. 349, tab. 68, fig. 650. 

 Ostrea subauriculata. Turton, Conch. Diet. p. 131. 

 Ostrea buUata. Dillwyn, Descript. Catal. p. 2"0. 

 Mtis. nost. From the western coasts. 



Shell much flatter and more elongated than the Lima buljata, 

 a little unequal at one of the sides, but not so much as in that 

 shell, with the cardinal margin in a nearly straight line : the 



