GASTEROPODA FROM 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 JV. biplicata 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. 
PLEUROTOMA FARMINGDALENSIS, n. sp. 
Plate xxi, 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. 
