GASTROPODA— NATICWM. 



721 



Ripleyan of New Jersey, Alabama, Mississippi, Texas. 

 389. G. conradiana Gabb. Cretacic. 



Like G. conradi but without the inner angulation around the 

 umbilicus. 



Vancouver group of Washington and Canada, Chico of 

 California. 



Fig. 1047. Gyrodes petrosa. (After Whitfield.) 



390. G. expansa Gabb. (Fig. 1048.) Cretacic. 



Whorls flattened at suture and flat or slightly concave below the 

 sutural angulation, basal portion without angulation. 



Chico of the Pacific Coast. 



Fig. 1048. Gyrodes expansa. (After Gabb.) 



CXV. Amauropsis Morch. 



High-spired, non-umbilicate, sides of whorls more or less flat- 

 tened ; those of the body whorl often parallel to axis ; sutural 

 flattening or shelf often nearly rectangular to sides. 

 Comanchic-Tertiary. 

 391. A. avellana Roemer. (Fig. 1049.) 



Comanchic. 



Small, subglobular with five or six whorls closely 

 embracing the last one. Large, rounded aperture, 

 semilunar, narrowing upwards ; outer lip slightly 

 reflexed, inner lip strong ; surface smooth. 



Edwards limestone of Texas. 



Fig. 1049. 

 Amauropsis 



avellana. 

 (After Roe- 

 mer.) 



