752 



NORTH AMERICAN INDEX FOSSILS. 



Ripleyan of New Jersey, Alabama, Mississippi. 

 495. A. sublaevis (M. and H.). (Fig. 1093.) Cretacic. 



Much smaller than preceding ; high-spired with round whorls 



Fig. 1093. Anchura sublcBvis y type of species. With apertural expansion wanting. 



(After Meek.) 



marked by faint spirals only. 



Pierre of Yellowstone and Black Hills. 



CXXXVI. Calyptraphorus Conrad. 

 Differs from Anchura] in ^having the entire shell more or less 

 covered by the expansion of the lips ; this hides the character of 

 the whorls. Tertiary-Recent. 

 496. C. velatus Conrad. (Fig. 1094.) Eocenic. 



Fig. 1094. Calyptraphorus velatus var. comp> cssus 



Expanded but rounded lip, the enamel covering most of the 

 whorls, leaving only the upper part of the spire exposed ; rostrum 

 long and pointed. In the variety compressus Aldrich, large gaps 

 remain in the enamel covering the upper edge of the lip which is 

 much prolonged and pointed. 



