550 NORTH AMERICAN INDEX FOSSILS. 



very obscurely striated transversely. Substance coarsely fibrous. 

 Upper Fredericksburg : Texas. 



FlG. 753. Caprina occidentalism views of both sides and cross section of left 

 valve, X Yz- (After Meek, Mex. Bd. Surv.) 



Fig. 754. Ichthyosarcolites anguis, complete individual with united valves and longi- 

 tudinal section of a part of a larger shell. ( After Roemer. ) 



