406 



NORTH AMERICAN INDEX FOSSILS. 



Jerseyan of New Jersey (characteristic of the Hornerstown 

 marl), Maryland (Monmouth). 



Fig. 522. Cucullcea tippana . (N. J. Pal., I.) 



2. C. tippana Conrad. (Figs. 522-523.) Cretacic. 



Basal margin nearly straight ; pos- 

 terior obliquely truncate. 



Ripleyan of New Jersey (Marshall- 

 town-Tinton), Texas (Navarro), Mis- 

 sissippi. 



113. C. neglecta Gabb. Cretacic. 



Smaller than C. tippana with more 

 rounded outlines. 



Ripleyan of New Jersey (Merchant- 

 ville and Navesink), Alabama. 



Fig. 523. Cucullcea tippana, inte- 

 rior of valve. (N. j. Pal., i.) 114. C. antrosa Morton. (Fig. 524.) 



Cretacic. 



Fig. 524. Cucullcea antrosa, internal molds. (N. J. Pal., I.) 



