GASTEROPODA OF THE LOWER GREEN MARLS. 53 
angle of nearly 90°, with the body volution proportionately large. Volu- 
tions four and a half to five in number, ventricose, the upper ones rounded 
on the exposed parts, even in the cast, with distinct, deeply marked sutures; 
body volution somewhat shouldered on the top, but not flattened; below it 
is short and very rapidly diminishing, so as to produce nearly a straight 
line from just below the point of greatest diameter to the margin of the 
cavity left by the removal of the columella or axis of the shell; aperture 
imperfect in form, but as seen by the section of the cast must have been 
acutely ovate, sharply pointed below and gradually widened upward for 
about two-thirds of its length, and rounded at the upper end; columella, as 
shown by the axial cavity, large and smooth, without folds or ridges; 
surface marked by numerous vertical folds, about eight of which may be 
counted on the outer half of the body whorl; these not seen on the east 
below the point of greatest diameter, indicating their absence on the lower 
part of the volution in the living shell; no remains of spiral lines preserved 
on the specimen. 
This species is readily distinguished from the others herein deseribed as 
casts by its ventricose and rounded volutions, more numerous vertical folds, 
shorter spire, and short dwarfish appearance as regards height. It is more 
easily mistaken for a form of Pyropsis, perhaps; but, as compared with any 
of those herein described, differs in the more rounded volutions and more 
numerous vertical folds. The form of the lower half of the body whorl 
and that of the margin of the axial cavity will readily distinguish them on 
comparison. : 
Formation and locality: Collected trom the ferruginous layers of the 
Lower Green Marls, at Mullica Hill, New Jersey, and furnished by Mr. 
Joseph McFarland, of Philadelphia. 
PYRIFUSUS PYRULOIDES. 
Plate Iv, Figs. 12, 13. 
Rapa pyruloidea Gabb: Proc. Acad. Nat. Sci., Phila., 1860, p. 94, Pl. mm, Fig. 4; 
Synopsis, p. 74; Meek, Check List Cret. and Jur. Foss., p. 21. 
Rapa pyruloidea ? (Gabb) Meek: Geol. N. J., Newark, 1868, p. 730. 
This species was described by Mr. Gabb from a single imperfect cast 
which is now in the collection at the Academy of Natural Sciences at Phil- 
