792 



NORTH AMERICAN INDEX FOSSILS. 



597. V. (Volutomorpha) conradi Gabb. (Figs. 11 59-1 161.) 



Cretacic. 



Rather large ; spire moderate, of rounded whorls with impressed 



sutures, sometimes a slight subsutural flattening; body whorl four 



fifths of length, varying in convexity, but contracted to the short 



Fig. 1 160. Volutomorpha conradi, FlG. 1161. Volutomorpha conradi, in- 



internal mold. (After Whitfield.) ternal mold (After Whitfield.) 



anterior canal ; ribs narrow, far apart, cancellated by strong spirals ; 

 internal molds commonly smooth. 



Ripleyan of New Jersey . 

 598. V. (Rostellites) biconicus Whitfield. (Fig. 11 62.) Cretacic. 



Spire elongated, forming about half the total length, somewhat 

 strongly flattened at the suture which in the internal molds is deep. 



Ripleyan of New Jersey, etc. 



