GASTEROPODA OF 'IHE LOWER GREEN MARLS. 23 



and even several families not represented in the lower strata make their ap- 

 pearance. The moUuscan remains found in this formation at Shark River, 

 Farmingdale, and Squankum, are also in the condition of casts, like those 

 in the Cretaceous, even the Ostreidce seldom preserving- the least vestige of 

 the shell substance. 



In these Eocene beds the species again become quite numerous. Al- 

 though not as abundant as in the Lower Green Marls, they far outnumber 

 those of the intermediate beds. Considering the few localities and the 

 slight thickness of the beds examined they have been prolific, having 

 yielded a total of 79 moUuscan species, of which 23 are Lamellibranchiates, 

 52 are Gasteropods and two Cephalopods, besides fragments of some eight 

 or ten other Gasteropods, the specimens of which are not sufficiently well 

 preserved for description and illustration. The following tables present 

 more readily the numbers of families, genera and species of moUuscan 

 remains occurring in the several formations, and the relative proportions 

 known from each bed. Table No. 1 shows the number of genera and 

 species of Lamellibranchiates represented under each family in each bed 

 except the Crosswicks Creek and Haddonfield bed, which are included in 

 the Lower Green Marls, while Table No. 2 shows the same features per- 

 aining to the Gasteronods and Cephalopods. 



