GASTEROPODA OF THE LOWER GREEN MARLS. 67 
nodes on the 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 anterior 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 narrow canal; columella marked by a single, 
rather strong, oblique fold, situated near the middle of the aperture pr yper; 
very faint indications of spiral striae may be imagined on the cast, but 
ean 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. 
Formatior. 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, 0. 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 exposed 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 
pytiform,' 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 suture 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 their passage from above dewn- 
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 ventricosity of the 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 
