780 NORTH AMERICAN INDEX FOSSILS. 



Pamunkey of Maryland and Virginia; Chickasawan (Lignitic) 

 of Alabama. 



CLXX. Fusoficula Sacco. 



Differs from the preceding in its higher spire, less pronounced 

 angulations and less patulous aperture. Eocenic. 



567. F. juvenis (Whitfield). (Fig. 1138,^ d.) Eocenic. 

 Shoulder flat to concave with ribs nodose on angle and extending 



a short distance above and below; whorls embracing to a second, 

 sharp, smooth, peripheral angulation below which is a third fainter 

 one; space between angulations concave, marked by numerous fine 

 spirals. 



Pamunkey (Aquia) of Maryland; Chickasawan of Alabama 

 and Texas. 



CLXXI. Odontofusus Whitfield. 



Fusiform, round-whorled, ribbed shells, with rather short canal 

 and a single oblique plication near the center of the columella. 

 Cretacic. 



568. 0. medians Whitfield. (Fig. 1 139.) Cretacic. 



Fig. 1 139. Odontofusus medians. (After Whitfield.) 



Whorls round; ribs straight, thin and distant; aperture broad; 

 canal short. 



Ripleyan of New Jersey and Mississippi. 



CLXXII. Clavilithes Swainson. 



Fusiform shells with cylindrical protoconch of many whorls; 

 early whorls ribbed and spiraled, later ones generally smooth, more 

 elongate and flattened ; a posterior canaliculation with sutural shelf 

 generally occurs. 

 569. C. kennedyanus Harris. (Fig. 1140.) Eocenic. 



Early whorls strongly ribbed, somewhat concave below the 



