662 



NORTH AMERICAN INDEX FOSSILS. 



lower less strongly marked ; a third carina on outer, nearly flat 

 portion of whorl, nearest to upper carina. Otherwise as in the 

 preceding. 



Coal measures of Ohio, Illinois, Missouri, Arkansas, Texas. 



LVIII. Calaurops Whitfield. 

 Inner whorls forming a low spire, embracing up to the angula- 

 tion, which is pronounced ; last whorl free and becoming straight, 

 Ordovicic. 

 185. C. lituiformis Whitf. (Fig. 914.) Ordovicic. 



Fig. 914. Calaurops lituiformis, two views with cross-section, X Vi- (After 

 Whitfield, Bull. Mus. Comp. Zool.) 



Inner portion of about two and one half volutions, depressed- 

 convex to flat ; angulations less pronounced on free whorls, which 

 curve to a larger radius and then grow straight. Surface with 

 coarse wrinkles alternating with finer growth lines. 



In the Upper Beekmantown or Ft. Cassin beds of the Lake 

 Champlain region. 



LIX. Eccyliomphalus Portlock. 

 Shells of loose coiled or disjointed spirals in a plane, like Phane- 

 rotinus, but with a well developed though shallow apertural notch, 

 and more or less strong upper keel. Ordovicic-Devonic(P). 



