GAfSTEROPODA PROM BASE OF THE UPPER GREEN MARLS. 185 



So we may readily suppose that the shell possessed both sets of mark- 

 ings in its perfect condition. 



This species is intermediate in form and characters between V. Abbottii 

 of the Middle Marls and F- bipUcata of the Lower Marls, and may be 

 readily distinguished from either by the length of the spire and the ventri- 

 cosity of the volutions; this latter feature bringing it nearer to V. biplicata; 

 while in the height of the spire it exceeds either of them. 



Formation and locality: The figured examples are from the Academy's 

 collection, and are labeled as from Vincentown, New Jersey, which would 

 most likely indicate the base of the Upper Marls. They are also credited, 

 on the label, to "T. M. Bryan," probably as the donor. 



PLEUROTOMID^. 



Genus PLEUROTOMA Lamarck. 



Plburotoma farmingdalensis, n. sp. 



Plate XXIII, Figs. 3, 4. 



Shell of medium size, with an elongated, turreted spire, composed of 

 numerous angularly ventricose volutions, which ascend rapidly, the entire 

 number unknown; apical angle about 30°; body volutions proportionally 

 larger than those above, contracted below and rapidly decreasing in diame- 

 ter, terminating in a short anterior beak, the length of which is not known; 

 periphery biangular on the outer two-thirds of the body whorl, as seen on 

 the cast; columella slender, smooth; aperture moderately large; outer lip 

 straightened along the middle; volutions marked on the angle by short, 

 oblique, vertical plications or elongated nodes, which are directed slightly 

 forward below, and are confined to the larger part of the volution on all 

 above the last one, where they are slightly visible on the lower angle. 

 About twelve of the vertical nodes may be counted on a single volu- 

 tion. The upper side of the last volution is slightly concave between 

 the angle and the suture line, marking the probable position of the notch of 

 the outer lip, although on the cast this feature itself can not be positively 

 traced. 



