19G AMERICAN MARINE CONCIIOLOGY. 



2. P. IsLANDicus, Miiller. Fig. 538. 



iOsirea.) Zool. Danica, Prod. No. 2990. 1776, 

 Pecten Pealii, Conrad. Am. Mar. Conch., t. 12, f. 2. 1831. 



Shell oblong, orbicular, slightly oblique, valves near]}' equal. 

 Surface covered with numerous, small, scaly, radiating ribs ; ears 

 unequal in size. Yalvcs closed except at the notch. Color light- 

 orange to dark reddish-brown, frequentl}^ zoned or blotched on 

 the upper valve, lower valve ligliter in color; white within, except 

 a large roseate spot near the beaks. 



Length 3.5 inches. 



Ifew England. {Eur.) 



3. P. IRRADIANS, Lamarck. Fig. 530. 



Anim. sans Vert., vi. Pecten No. 37. 1819. 

 P. concentricus. Say, Journ. Pbilad. Acad., ii. 259. 1823. 



Shell orbicular, with from eighteen to twenty elevated, rounded 

 ribs, and numerous concentric wrinkles ; inferior valve slightly 

 ventricose or gibbous towards the uml)o ; ears large and nearly 

 equal. The upper valve is generally brown witii pale zones, and 

 tlie lower valve yellowish or wliitish with pale brown zones. 

 Diameter 2-3 inches. 



Whole Coast. 



The animal of the "scallop" is eaten, and is comparable in 

 flavor to the lobster. The species is particularly numerous and 

 well-grown on the shores of Long Island and New Jersey, where 

 the young shells, on a clear calm day, may be observed skipping 

 along to a considerable distance on the surface of the water ; the 

 movement being accompanied by the noise occasioned hy the rapid 

 closing of their valves. The adults are not active. 



4. P. DiSLOCATUS, Say. Fig. 540. 



Jouru. Philad. Acad., ii. 260. 1824. 



Shell suborbicular, with twent3' or twenty-two rounded ribs, and 

 ver^' numerous concentric wrinkles; longitudinal striai none; 

 whitish tinged with purple or ^-ellow, witli a i'aw narrow, trans- 

 verse, interrupted and dislocated sanguineous, undulated lines, 

 and sometimes five or six pale-reddish, almost obsolete spots 

 towards the margin ; ears subequal. 



Diameter 1.5 inches. 



North Carolina, southwards. 



