196 AMERICAN MARINE CONCHOLOGY. 
2. P. Istanpicus, Miller. Fig. 538. 
(Ostrea.) Zool. Danica, Prod. No. 2990. 1776. 
Pecten Pealii, Conrad. Am. Mar. Conch., t. 12, f. 2. 18381. 
Shell oblong, orbicular, slightly oblique, valves nearly equal. 
Surface covered with numerous, small, scaly, radiating ribs; ears 
unequal in size. Valves closed except at the notch. Color light- 
orange to dark reddish-brown, frequently zoned or blotched on 
the upper valve, lower valve lighter in color; white within, except 
a large roseate spot near the beaks. 
Length 3.5 inches. 
New England. (Eur) 
3. P. iRRADIANS, Lamarck. Fig. 539. 
Anim. sans Vert., vi. Pecten No. 37. 1819. 
P. concentricus, Say, Journ. Philad. Acad., ii. 259. 1822. 
Shell orbicular, with from eighteen to twenty elevated, rounded 
ribs, and numerous concentric wrinkles; inferior valve slightly 
ventricose or gibbous towards the umbo; ears large and nearly 
equal. The upper valve is generally brown with pale zones, and 
the lower valve yellowish or whitish 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 by the rapid 
closing of their valves. The adults are not active. 
4. P. pisLocatus, Say. Fig. 540. 
Journ. Philad. Acad., ii. 260. 1824. 
Shell suborbicular, with twenty or twenty-two rounded ribs, and 
very numerous concentric wrinkles; longitudinal strie none; 
whitish tinged with purple or yellow, with a few 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. 
