130 r OSTREA. 



that the red color frequently diffuses itself over the surface, 

 sometimes over the ribs of the flatter valve, and even on 

 the inside. But the strongest evidence for their specific 

 union, is the somewhat oblique outline equally observable 

 in both, and which is more pec uliaiiy distinguishable with- 

 inside, or on the flatter valve, one end being more sloping 

 from the ears, and the opposite end appearing as if it were 

 more produced. 



On most sandy shores, v. v. 



4. Ostrea varia. Prickly Scallop. 



Lister,p\. 180. f. 17, 181. f. 18, and pi. 189. f.23 Pen- 

 nant, pi. 64. f. 1 Da Costa, pi. 10. f. 1 , 2, 4, 5, 7, and 9 

 Donovan, pi. 1. f. 1 Dorset Cat. pi. 10. f. 1, 2, 4, 5, 7, 

 and 9. 



Shell oblong, with about thirty rounded ribs, which are 

 rough with concave spines, especially ahout the margin, 

 both valves equally convex : color and markings variable 

 like O. opercularis, but generally of a darker hue, some- 

 times blackish purple marbled with yellowish white with 

 the inside dark glossy purple, sometimes pale with a pink 

 tinge, and rarely of an uniform white, pink, deep green or 

 orange : ears very unequal ; the longest veiy much wrin- 

 kled on the upper edge, the other edge striate and fringed 

 with spines ; the lesser valves both striate and fringed : 

 length two inches and a half 5 breadth two inches. 



Sandy shores, v. v. 



5. Ostrea sinuosa. Distorted Scallop. 



Lister, pi. 1/2. f. 9 Pennant, pi. 64. f, 2 Da Costa, 

 pi. 10. f. 3, 6 Dorset Cat. pi 10. f. 3, 6. 



Pecten Pusio. Donovan, pi. 34. 



Shell oblong, sometimes nearly orbicular, more or less 

 distorted on the surface and irregular at the margin, often 

 very rough with spinous foliations, with numerous very 

 fine ribs or lines, some of them larger and slightly tubercled 

 by transverse strife : one of the valves very convex and 

 deformed by swellings and protuberances ; the other much 

 flatter and more even : color pink or brownish, or marbled 

 with white : ears sometimes nearly equal and striate, 

 often very unequal, and frequently hardly distinguishable; 



the 



