

766 



NORTH AMERICAN INDEX FOSSILS. 



FlG. 1116. Pyropsis richardsoni, y^ %. (After Whitfield. ) 



canal ; spirals numerous, alternating, the primary ones noded. 

 Internal molds with loose sutures and smooth surfaces. 

 Ripleyan of New Jersey, Alabama and Mississippi. 



FlG. 1 117. Pyropsis trochiformis, internal mold and fragment showing surface, X %• 



(After Whitfield.) 



533. P. whitfieldi Weller. (Fig. 11 18.) Cretacic. 



Small ; whorls round ; later whorls embracing only to ambitus ; 

 flattened below the suture; spirals simple, rather coarse, noded by 

 ribs of equal size. 



Ripleyan of New Jersey and Alabama. 



