ANOMIA. KOlVL-SHELLs 3 



larly cut down the sides and leaving the front margin a 

 mere ohtuse point, rough on the outside but not irregular 

 nor undulate, white with a tinge of pale purple: upper 

 valve convex, slightly inflected both at the beak and front 

 margin: beak a little projecting, and curved over the lower 

 valve, which is rugged with a large perforation near the 

 summit : length an inch and a quarter ; breadth at the 

 hinge an inch. 



This singular variety, if it be only a variety, we have 

 found both in Dublin bay and the soutli of Devon; and it may 

 be remarked, that the oval perforation of the under valve 

 points in an opposite, direction to that of A. Ephippium. 



On most rocky coasts, v. v. 



3. Anomia Squamula. Scaly BowLsliell. 



Walker, f. 80 Dorset Cat. pi. 13. f. 4. 



Shell rounded, smooth, regular and entire at the margin; 

 the upper-valve nearly fiat, with a small beak projecting 

 beyond the margin, very thin, transparent, dirty white or 

 horn color ; inside silvery, or tinged with green ; under 

 valve extremely thin and filmy, like the scale of a fish, 

 ,often wrinkled or ribbed and a little concave, perforated 

 near the hinge : diameter about half an inch. 

 We have found this shell full an inch in diameter, and 

 with the surface quite smooth : on the ether hand we have 

 the A. Ephippium from two-tenths of an inch to more than 

 three inches in diameter, all of them preserving the irre- 

 gular undulations of the margin. These circumstances, to- 

 gether with the different appearance of the beak, which 

 always projects beyond the margin, make us consider it 

 as a distinct species. 



On stony or rocky coasts, v. v. 



4. Anomia Cepa. Onion-peel Bowl-shell. 



Shell with the upper-valve very convex or semiglobular, 

 sometimes inclining to oval, very slightly wrinkled, of a 

 glossy reddish-violet color, not unlike the coat of an onion,; 

 lower-valve nearly fiat, and perforated near the hinge ; in- 

 side glossy pale violet : diameter about an inch. 



On the English and Irish coasts, v. m. 



B 2 5, Anomia 



