442 



NORTH AMERICAN INDEX FOSSILS. 



Fig. 581. a, Inoce ramus fragilis, right valve ; b, c, I. gilberti, left valve. All X K* 

 (U. S. G. S., Bull. 106, after Stanton.) 



211. I. undabundus Meek and Hayden. (Fig. 582, c y d.)* 



Cretacic. 



^m 



pp^a 



Fig. 582. a, Inoceramus deformis, right valve ; b, I. umbonatus, cardinal view of 

 left internal mold ; c, d, I. undabundus, left valve. All X X- (U. S. G. S., Bull. 

 106.) 



