158 | PALEONTOLOGY OF NEW JERSEY. 
which may have been punctate on the shell, as on one of the casts there 
are indications of such a feature having existed; this, however, is by no 
means certain. No transverse markings, other than perhaps fine lines of 
growth, are indicated on any of the specimens present. 
The species differs from any of the associated forms in the propor- 
tions of the shell, being much more robust than in Acte@on Gabbana, and 
much less so than 4. bullata. In fact it is of a very different type from 
the latter species. It bears some relation to Act@on ovoidea Gabb, but is 
a much shorter and smaller species, and has been entirely destitute of the 
broad longitudinal ribs credited to that one; nor has it had a second fold 
on the columella in advance of a “large broadly rounded” one as de- 
scribed on that shell, the fold being quite faint and slight on all the 
specrmens examined. The figure given by Lyell and Forbes above cited 
is quite characteristic, and shows a somewhat larger individual than any 
which I have seen. 
Formation and locality: In the Lower Green Marls at Mr. C. Bruere’s 
pits, near Walnford, New Jersey, and probably from Crosswicks Creek, 
and in the white limestone layers at Marlborough, New Jersey; the lat- 
ter two localities I assign to some specimens in the cabinet of the Acad. 
Nat. Sci., Phila., from their lithological characters; no locality further than 
“N. J.” being found with them. 
ACTON CRETACEA. 
Plate x1x, Fig. 9-12. 
Acteeon cretacea Gabb: Proc. Acad. Nat. Sci., Phila., 1861, p. 318; Meek, Check 
List Cret. and Jur. Foss., p. 17; Geol. N. J., Newark, 1868, p. 728. 
Compare A. ovidea Gabb: Proc. Acad. Nat. Sci., Phila., 1861, p. 319. 
Shell smaller than that of A. ovoidea, but very similar in form and 
proportions, being somewhat more pointed below the middle and at the 
base. There is considerable difference between the descriptions of the two 
species as given by Mr. Gabb, and it is extremely difficult to tell which of 
the forms he has had in hand when writing them, except for the difference 
in size; for a part of each description applies best to one and the other 
part to the other, in each case; while I am strongly inclined to consider 
