498 



NORTH AMERICAN INDEX FOSSILS. 



Fig. 665. Pecien ( Vola) roemeri, X f • (After Shattuck. ) 



which do not extend across the ears, and are usually marked with 

 five or six radiating lines. Left valve usually smooth. 

 New Jersey (Merchantville-Navesink). 



Fig. 666. Pecten (Neithea) quinqucco status. A large specimen. (After 

 Whitfield, Pal. N. J., I.) 



369. P. simplicius Conrad. (Fig. 669.) Cretacic. 



Differs from P. conradi in the smooth surface of its valves. 



