OF CONCHOLOGY. 45 



This much curved form is peculiar to the cretaceous formation. 

 There is one other similar species in India — D. hamatum. 



N A TIC ID ^E. 

 LUNATIA ? Gray. 



L. OBTUSivoLVA, Gabb. — PI. 1, fig. 11 {G-yrodes, Gabb), Pro- 

 ceed. Acad. Nat. Sc. 1861, p. 321. 



CANCULLARIID^. 



TURBINOPSIS Conrad. 

 T. DEPRESSA, Gabb. — Proceed. Acad. Nat. Sc. 1861, p. 321. 

 Locality. — Crosswicks, N. Jersey. 



CERITHIIDjE? 



PI. 1, fig. 15. 



This cast cannot be referred to any known genus, unless to 

 Torcida. 



VOLUTID^^. 

 PI. 1, fig. 20. 



A common form in the lower beds, too imperfect to charac- 

 terize. 



Locality. — N. Jersey. 



My apology for publishing the above casts of shells is that 

 they characterize the lower beds of the eastern Cretaceous, in 

 which I believe no shell has yet been found with the substance 

 preserved. 



