222 NORTH AMERICAN INDEX FOSSILS. 



Fig. 1500. Stantonoceras guadaloupce (Roemer), side and end view, and section, 

 X /^ > ^^so section of young stages {d). (After Hyatt. ) 



Fig, 1501. Stan- 

 tonoceras pseudocosta- 

 tunty section, X Yz- 

 (After D. W. John- 

 son.) 



Fig. 1502. Barroisiceras dentatocarinatum. (After Roemer. ' 



