GASTEROPODA OF THE LOWER GREEN MARLS. 23 
and even several families not represented in the lower strata make their ap- 
pearance. The molluscan 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 Ostreide 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 mollusean 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 molluscan 
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. 
