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 

 striae; also similar striae 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 striae 

 parallel to the margin of the aperture. 



This shell is the most abundant of any of the Volutidce in the Eocene 

 layers of marls, as well as the smallest. The prevailing length is about 

 1^ 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. Newcomhiana, 

 but do not feel certain. 



Formation and locality: In the upper layer of the Upper Grreen Marls, 

 at Shark River, New Jersey. Collections Rutgers College and Am. Mus. 

 Nat. Hist. 



VOLUTA SCAPHOIDES, n. Sp. 



Plate XXXI, 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, sHghtly 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 xviii 14 



