GASTEROPODA OF THE EOCENE MARLS. 191 
Formation and locality: In the stony marls of the Upper Green Marls at 
Shark River, New Jersey. Rutgers College collection. 
MUREX? sp. undetermined. 
Plate xxiv, Fig. 3. 
A fragment of the matrix of a species of peculiar character, probably 
of Murex, occurs among the Shark River specimens. The specimen had 
passed through Mr. Conrad’s hands and had been marked by him as Murex 
previous to his death. It represents a specimen-somewhat below a medium 
size, with sharp, angular volutions, few in number, and marked by sharp, 
supspinose varices or vertical folds. The spire has been rather short, in 
fact not longer than the body volution below the angulation. I have given 
a figure of the specimen as it shows on a gutta-percha cast taken from the 
matrix, and presenting all that is left of it at the present time. It is possi- 
ble that when Mr. Conrad used it there was much more of the matrix show- 
ing than now, as it is very friable and rapidly crumbles. The specimen 
presents to me much more the appearance of. a species of Cuma Humph. 
than of an ordinary Murez, although there is not enough of it remaining to 
definitely determine its generic relations: The specimen is from the upper 
layers of the Shark River Marls, at Shark River, New Jersey, and may be 
found in the cabinet at Rutgers College. 
Genus RHINOCANTHA H. & A. Adams. 
RHINOCANTHA (?) CONRADI, n. sp. 
Plate xxiv, Figs. 8-11. 
Priscoficus Smitha ? (Sow.) Conrad: Meek, Check List Eocene Foss., p. 16; Meek, 
Geol. N. J., Newark, 1868, p. 732. 
Not Murex Shuthit Sow. : Mineral Conch., vol. 6, p. 151, tab. 578, Figs. 1-3. 
Pyrula Smithii (Sow.) Conrad: Meek and others, when referred to as occurring 
in New Jersey. 
Shell, as known from internal casts, short-pyriform, or shortly turbi- 
nate, with a rather low spire somewhat rapidly contracted below, forming a 
slender anterior beak of unknown length. Volutions: in the cast not 
exceeding four in any of the specimens known, rather rapidly increasing 
in size and very ventricose, the upper surface flattened nearly in the direc- 
tion of the very low spire, and seldom showing more than the slightest 
