40 PALEONTOLOGY OF NEW JERSEY. 
ber and increase very rapidly in size, with wide sutures in the cast, indi- 
cating a thickened shell; aperture large, semilunate above, but contracted 
below to form the canal; the columellar cavity in the cast rather large, 
without any evidence of fold or twisting; surface of the casts usually 
smooth, the markings of the shell not transmitted to its inner surface, but 
often marked on the inner face of the whorls; the shell as shown on two 
different individuals, one preserving a portion of the substance, the other 
retaining a part of the matrix, has been covered by very strong, nodose 
spiral bands or ridges, with sometimes smaller secondary lines between. 
These have even existed on the columella and the beak, and very closely 
resemble the markings of P. trochiformis, from which it differs, however, 
in the flattened upper surface of that species and the strong fold on its 
columella. 
Formation and locality: In the Lower Green Marls at Freehold and 
Crosswicks Creek and at the Neversink Hills, New Jersey, and in iron 
nodules from the plastic clays near Freeport, New Jersey. Collections at 
Rutgers College. 
PYROPSIS ? OBESA, 0. Sp. 
Plate m1, Figs. 12, 13. 
Shell of moderate size, very ventricose, with very round, full, short 
volutions, and short obtuse spire, the body volution being produced below 
to form a short beak of almost insignificant proportions, as shown by the 
cast; apical angle about 80 degrees; volutions about three im number, very 
short and compact; smooth on the surface, except on the last one, where 
spiral lines are shown to have existed on the shell and to have left their 
imprint; only about five or six of these traceable, and those on the lower 
side; aperture moderately large, obliquely ovate, rounded above and pointed 
below; columella rather strong, somewhat flexuose, judging from the axial 
cavity left in the cast, and apparently marked by a single, rather promi- 
nent oblique ridge in its lower part. 
This cast presents the general features of a Pyropsis, but differs in the 
possession of the columellar fold or ridge, and I am at a loss to place it sat- 
isfactorily under any known genus. Perhaps the matrix might show its 
