722 NORTH AMERICAN INDEX FOSSILS. 



392. A. bulbiformis (Sowerby). (Fig. 1050.) Cretacic. 



Fig. 1050. Amauropsis bulbiformis, \ %. (After Stanton.) 



Large, whorls moderately convex, slightly 

 depressed below sutural angulation ; sutural 

 shelf depressed or canaliculate, outer lip nearly 

 vertical. 



Colorado group (Pugnellus sandstone and 

 Benton shale) of Colorado. Widely distribu- 

 ted in Europe and Asia. 



393. A. alveata (Gabb). (Fig. 1051.) 



Cretacic (P)-Tertiary. 

 Like preceding but with more convex 



P'lG. 105 1. Amauropsis 



{ .) w j lor j s anc j broader not depressed sutural 



shelf. 

 Chico (?) and Tejon formation of Pacific coast. 



Family Rissoid^e Troschel. 

 CXVI. Rissoina d'Orbigny. 



Small turreted shells with arcuate outer lip thickened and 

 slightly notched or drawn out below, and angular above. Sur- 

 face with ribs, more rarely smooth. Jurassic-Recent. 

 394. R. laevigata Adams. Oligocenic-Recent. 



Smooth, with sutures scarcely depressed ; body whorl rounding 

 below ; protoconch of several whorls, shaped like a small Vertigo. 



Chipolan and Caloosahatchie beds of Florida ; living from Cape 

 Hatteras to the Antilles, also Indo-Pacific. 



