CO^GRYUA—niTHYRA. 46. 211 



Turton, Conch. Diet. p. 130. 

 Pecten distortus. Da Costa, p. 148, tab. 10, fig. 3 and 6. 



Montagu, Test. Brit. p. 148. 

 Pecten sinuosus. Pennant, Brit. Zool. iv. p. 222, tab. 64, fig. 2. 



Donovan, British Shells, i. tab. 34. 



Turton, British Fauna, p. 161. 

 Pecten minor. Lister, Conch, tab. 172, fig. 9. 



Mus. nost. From rocks on the western coasts. 



Shell about an inch and a half long, orbicular or inclining to 

 oval, variously mishapen and distorted, of a pink or brownish color 

 irregularly marbled or marked with chocolate brown ; the lower 

 valve generally much more convex, with the figure and ribs of the 

 shell occupying about half the surface, the other part shooting into 

 foliations or spines ; sometimes the upper valve more convex and the 

 under one flat : the fine ribs are about forty in number, and more 

 or less clothed with spines or scales. 



6. 



Pecten testa oequivalvi, striis transversim minutissimis, radiis 7 ad 10 glaber. 



obsoletis rotundatis, intus sulcis numerosis. 

 Shell equivalve, with very minute transverse striae, and from 7 to 



10 obscure rounded rays, and numerous grooves in the inside. 

 Ostrea glabra. Turton, Conch. Diet. p. 132. 



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



Montagu, p. 150, Suppl. 59, tab. 28, fig. 6, 

 Turton, British Fauna, p. 1 12. 

 On the Scotch coast, near Dunbar. 



