io8 



NORTH AMERICAN INDEX FOSSILS. 



137. E.(?) bryani (Gabb). (Fig. 1336.) Cretacic. 



More compressed laterally than preceding and with moderate 

 umbilicus. 



Jerseyan of New Jersey. 



LII. Cymatoceras Hyatt. 

 (Nautilus in part of authors.) 

 Strongly involute nautilicones with strong transverse costae 

 extending across the entire shell ; abdomen rounded ; sides gibbous, 

 becoming compressed in adults of some species ; sutures with ven- 

 tral saddles ; shallow lateral and dorsal lobes ; siphuncle usually 

 subcentren; young non-costate. Comanchic-Cretacic. 



138. C. carlottense Whiteaves. (Fig. 1337.) Comanchic. 



Fig. 1336. ..,,.,.„. ^Eutre- 

 phoceras f) bryani, X Vi,' (After 

 Whitfield, Pal. N. T., 11.) 



Fig. 1337. Cymatoceras carlottense^ X z^- 

 (After Whiteaves, Mes. Foss., I.) 



Large (maximum diameter 7 inches), subglobose, but depressed 

 in umbilical region which is closed or nearly so ; aperture subcir- 

 cular to subquadrate, with deep, impressed zone; ribs flattened, 

 numerous (about 60), curving forward with moderately deep re- 

 curve; interspaces of about same width or less. 



Queen Charlotte formation (Div. C) of Queen Charlotte 

 Islands. 



