CEPHALOPODA— AMMONOIDEA. 



167 



274. G. sacya Forbes. Comanchic. 

 Young similar to preceding; adnlt with well developed, broad 



ribs and narrower interspaces (diameter of shell up to six inches 

 or over). 



Upper Horsetown of California, abundant; Queen Charlotte 

 formation of Queen Charlotte Islands, Japan, India, etc. 



275. G. denmanense Whiteaves. (Fig. 1414.) Cretacic. 

 Umbilical margins of shell rounded rather sharply; umbilicus 



more than half the diameter of the entire shell; surface with about 



Fig 1414. Gaudryceias den- 

 manense. (After Whiteaves, Mes. 

 Foss., I.) 



Fig. 1 41 5. Pseudophyllites indra, X K* 

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



five low varices in a volution, and fine forward arching riblets which 

 occasionally bifurcate, and also increased by intercalation. 



Nanaimo group of Denman and Hornby Islands, Vancouver. 



CXXII. Pseudophyllites Kossman. 



Differs from preceding in its strong involution, rapidly enlarg- 

 ing whorls, and absence of constrictions (varices). Cretacic. 

 276. P. indra (Forbes). (Fig. 1415.) Cretacic. 



Large, with flattened sides and abrupt umbilicus ; surface smooth, 

 with faint, distinct, transverse furrows. 



Nanaimo of Vancouver (Hornby Island), also India. 



