120 CRETACEOUS PALEONTOLOGY. 



1 47 s . Lying above the bed containing such an abundance of 

 Belemnitella there are about 18 inches of gray, sandy marl, whose 

 fauna contains a larger number of species, although the number 

 of individuals is very much smaller. The following species have 

 been identified: 



PELECYPODA. 



Cucullaea antrosa Mort. 

 Exogjra costata Say. 

 Pecten whitfieldi n. sp. 

 Veniella trigona 'Gabb. 

 Tenea paralis Con. 

 Cardiwm spillmani Con. 



GASTROPODA. 



Margarita abyssima (Gabb.). 

 Lunatia halli Gabb. 

 Anchura pennata Mort. 



CEPHALOPODA. 



Belemnitella americana Mort. 



I47 4 . This bed is about I foot in thickness and contains a 

 larger fauna than either of the two lower horizons. It is still a 

 sandy marl, but the glauconite content is larger than in the beds 

 below. In the fauna of this bed Gryphaea is again abundant, but 

 Belemnitella is one of the less common species. The following 

 species have been identified : 



BRANCHIOPODA. 



Terebrafella plicata Say. 



VERMES. 



Hamulus lineatus n. sp.. 



PEIvECYPODA. 



Cucullaea antrosa Mort. 

 Axinea subaustraiis (d'Orb.). 



