8o8 



NORTH AMERICAN INDEX FOSSILS. 



outer lip thick and extended; surface with uniform fine spirals, 

 slightly crenulated; columellar lip thick with three narrow, equal 

 and prominent folds. 



Horsetown of California, etc. 

 646. C. (Ringinella) polita Gabb. (Fig. 11 88.) Comanchic. 



Spires higher, whorls rounder, and sutures more impressed than 



Fig. 1 187. Cinulia matthetvsoni, with 

 enlargement of surface. (After Gabb.) 



Fig. 1 188. Cinulia {Ringinella) 

 polita, enlarged. (After Gabb.) 



in preceding ; outer lip scarcely thickened, not extended ; columella 

 without callus and with two unequal columellar teeth. Surface 

 with spirals. 



Horsetown of California, etc. 

 647. C. obliqua Gabb. (Fig. 11 89.) Cretacic. 



More globular than C. mathewsoni; spire shorter, almost covered ; 

 body whorl large ; outer and inner lips strongly thickened, the latter 



Fig. 1 189. Cinulia obliqua. 

 (After Gabb.) 



Fig. 1 190. Ringicula dalli, much 

 enlarged. (Md. Survey.) 



with one large columellar fold and slight intumescence; surface 

 with spirals; interspiral space with crossbars. 



Upper Cretacic beds of Pacific coast and Canada. 



CCI. Ringicula Deshayes. 

 Thick-shelled, with mamillose protoconch, short spire, large 

 body whorl and outer lip with reflected and greatly thickened 



