362 America?! Seashells 



6 to 8 inches in size, roughly circular; upper valve almost flat, reddish 

 gray and with about 17 low, rounded ribs; lower valve deeper, whitish and 

 with a few more, stronger, rather flat-topped ribs. This is the common, 

 edible deep-sea scallop of Alaska. 



Subgenus Amusiujn Roding 1798 

 Pecten papyraceus Gabb Paper Scallop 



The Gulf of Mexico and the West Indies. 



About 2 inches in size, oily smooth, glossy, exterior without ribs, but 

 internally with about 22 very fine ribs which are commonly arranged in 

 pairs. Both valves moderately convex to flattish. Upper valve light-mauve 

 to reddish brown with darker flecks. Lower valve whitish at the center 

 with yellow to cream margins or all white. Hinge line strongly arched. 

 Rather rare in collections, but commonly brought up from several fathoms 

 by shrimp fishermen. 



Pecten laurenti Gmelin (pi. 33f) from the Greater Antilles is larger, 

 with a straight hinge line and with the lighter-colored valve more convex 

 than the darker valve. Rare. 



Section Euvola Dall 1897 

 Pecten ziczac Linne Zigzag Scallop 



Plate 33d 



North Carolina to Florida and the West Indies. 



2 to 4 inches in size. Upper (left) valve flat; lower valve very deep and 

 convex. There are 18 to 20 broad, very low, rather indistinct ribs on the 

 deep valve which is generally colored a brownish red (rarely orange). The 

 ribs fade out or are not present near the side margins of the valve. Flat 

 valve with a bright mozaic of whites and browns. A fairly common species. 

 Do not confuse with raveneli. 



Pecten raveneli Dall Ravenel's Scallop 



Plate 33g 



North Carolina, the Gulf of Mexico, and the West Indies. 



I to 2 inches in size, similar to ziczac, but the deep valve has about 25 

 very distinct ribs which are commonly whitish in color. Between them are 

 fairly wide, tan or pinkish grooves. In the flat valve, the 25 or so ribs are 

 rounded in cross-section whereas in ziczac they are flat-topped and much 

 closer together. A rather uncommon species. 



