728 NORTH AMERICAN INDEX FOSSILS. 



Rather high-spired, with more or less distinct sutural shelf and 

 exceedingly fine spiral lines. 



Laramie of the Upper Missouri Region, and of the Bow and 

 Belly River regions of Canada. 

 416. C. multistriatum M. and H. (Fig. 1057, h.) Cretacic. 





Fig. 1057. a, b, Campeloma macrospira ; c, d, C. vetulum ; e-g y C. muUilineatum ; 

 A, C. multistriatuju ; i-k, C. productum. (After White, U. S. G. S. ) 



Rather small, many-whorled, apical angle about 45 degrees ; 

 sutures impressed, no shelf, whorls round. 



Laramie of Colorado, Wyoming, and the Upper Missouri River 

 region generally. 

 417. C. productum White. (Fig. 1057, i-k.) Cretacic. 



Long and slender, approaching Goniobasis. Apical angle 30-40 

 degrees, in some cases with very faint sutural shelf, rarely faintly 

 angulate and with few faint spires. 



Laramie of the Yellow Stone River region, and in the Bow 

 River region and elsewhere in Canada. 



