GASTEROPODA OF THE LOWEK GREEN MARLS. 67 



nodes on tlie periphery and only extend a short distance above or below, 

 apparently never reaching to the suture line; lower portion of the body 

 volution extended so as to form a rather slender afiterior beak, about equal- 

 ing in length the vertical diameter of the body volution, as seen from the 

 dorsal side; aperture moderately large, angular at the middle of the outer 

 lip and extended below in a nan'ow canal; columella marked by a single, 

 rather strong, oblique fold, situated near the middle of the aperture proper; 

 very faint indications of spiral strise may be imagined on the cast, but 

 can scarcely be said to exist. 



This species differs from all the others in its angular volutions, and in 

 the character of the vertical node-like folds. 



Formation and locality: In the Lower Green Marls at Crosswicks, near 

 New Egypt, and at Cream Ridge, New Jersey. From the collections at 

 Rutgers College. 



Odontofusus medians, n. sp. 

 Plate V, Figs. 18-21. 



Shell as known from casts, slender, turreted, with ventricose volutions, 

 which are most convex above the middle of the exjoosed part; body whorl 

 rapidly contracted below and extended into a slender, straight canal; spire 

 slender, longer than the shell below when viewed from the back; apical 

 angle 35° to 40°; volutions five in number, with strongly marked suture 

 lines ; columella slender, marked by a single, sharply defined, oblique pli- 

 cation near or perhaps below the middle of its length ; aperture obliquely 

 pyriform, broadest above the middle and narrowed below, equal to or 

 longer than one half the length of the entire shell ; volutions marked by a 

 moderate number of vertical folds which extend from suttire to suture on 

 the whorls, and on the body volution can be traced nearly to the axis of the 

 shell and are directed slightly forward in fheir passage from above down- 

 ward. No evidence of spiral lines on the surface can be seen. 



This species is intermediate between the other two species herein de- 

 scribed, in its apical angle, in the A^entricosity of tlie volutions, and in the 

 number of vertical folds crossing the volutions. The last volution does not 

 increase any more rapidly than those above, in which feature it agrees with 



