GASTEllOPODA OF TdB EOCENE MAULS. 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 Murex, 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 (?) CONEADI, n. Sp. 



Plate XXIV, Figs. 8-11. 



Priscoficus Smithii ? (Sow.) Conrad: Meek, Check List Eocene Foss., p. 16; Meek, 



Geol. ISr. J., Newark, 1868, p. 732. 

 Not Murex Smithii 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 



