818 NORTH AMERICAN INDEX FOSSILS. 



Fig. 1205. a, Physa carltoni; b, c, P. copei ; d, P. pleromatis ; <?, P. bridgerensis ; 

 /, g, Carinifex binneyi ; h-j> C. tryoni. 



684. P. veternus M. and H. (Fig. 1206, a-f.) Jurassic. 

 Small; whorls numerous, regularly enlarging, coiled nearly in 



a single plane. 



Non-marine Jurassic of Colorado, Dakota (Black Hills) and 

 British Columbia. 



685. P. convolutus M. and H. (Fig. 1206, g-i.) Cretacic. 

 Larger than preceding, with less symmetrical disposition of 



whorls. 



Judith River beds of upper Missouri River region. 



686. P. (Bathyomphalus) amplexus ( M. and H. ) . ( Fig. 1 206, /, k. ) 



Cretacic. 

 Numerous whorls, very gradually enlarging, deep umbilicus, 

 with shell slightly angulated around it. 

 Judith River beds of Nebraska. 



687. P. (Bathyomphalus) planoconvexus (M. and H.). (Fig. 

 1206, /.) Eocenic. 

 Spire flat, whorls depressed above, angulated externally and 



around the umbilicus; umbilicus very large. 



