GASTEROPODA OF THE EOCENE MARLS. 209 
determined from the casts, and also slightly extended upward at the upper 
angle. Columella proportionally strong and marked by four or more very 
oblique folds, the upper one of which is thread-like, and the others much 
stronger. Surface of the shell marked on the upper volutions by fine spiral 
strie; also similar strize can be observed near the base of the principal volu- 
lution, while the body of this volution seems to be destitute of ‘such mark- 
ings. ‘The entire shell is also marked by somewhat distinct transverse strie 
parallel to the margin of the aperture. 
This shell is the most abundant of any of the Volutide in the Eocene 
layers of marls, as well as the smallest. The prevailing length is about 
14 inches. It is a neat and rather pretty form, and differs in its size and 
shape from the other associated species. A single individual referred to the 
same species with some doubt, on account of its immature appearance and 
smaller number of volutions, preserves the mammillated apex or nucleus 
which is turned on one side but not reversed. On account of the above 
mentioned peculiarities of this specimen and a difference in the form of the 
volution, I have thought it might possibly be the young of V. Newcombiana, 
but do not feel certain. 
Formation and locality: In the upper layer of the Upper Green Marls, 
at Shark River, New Jersey. Collections Rutgers College and Am. Mus. 
Nat. Hist. 
VOLUTA SCAPHOIDES, n. sp. 
Plate xxXxI, Figs. 6-8. 
Shell large, rather above a medium size, and, judging from the cast, 
has probably been heavy in substance. Volutions five or six in number, the 
last one large and obconical in form below the shoulder, where it is obtusely 
angular and concave on the upper surface, while below the angulation it is 
gently convex; spire short, probably not more than one-third of the entire 
length, but in the only specimen examined is obliquely compressed and dis- 
torted, destroying the proportions to so great an extent that they can not be 
positively determined; upper volutions very distinct, slightly subangular and 
with distinct sutures; aperture large, considerably more than half as long 
as the entire shell, broadly channeled below; columella strong, marked by 
four or more strong, distant folds, the second one from above being near 
MON XvIlI——14 : 
