118 PALEONTOLOGY OF NEW JERSBY. * 
number, none of the specimens being perfect at the apex, leaving the mat- 
ter somewhat in doubt; whorls moderately convex in the casts with well 
marked and distinct sutures; the surfaces between them varying from 
slightly flattened in the lower part of the spire to very round in the upper 
whorls, indicating a thickened shell for the upper parts, and less thickened 
below; body whorl rather large, the upper margin strongly directed upward 
as it approaches the aperture, extending to or above the middle of the pre- 
ceding volution before it becomes free, and showing a strong rounded 
ridge near the upper margin, where it begins to form the apertural projec- 
tion of the lip, strongly compressed or flattened below on the back of the 
whorl, while the lower part is quite abruptly contracted below to form the 
anterior canal or beak, but without any indication of an angle. The 
anterior beak or canal has been slender, but its length is not determinable 
from any of the specimens seen; aperture, as shown by the cast, narrow 
in width, but elongated in an anterior and posterior direction, resulting 
from the compression of the volution on the back; lip unknown; surface 
marked by oblique vertical folds, which are numerous and strongly directed 
forward in passing from above downward, becoming obsolete on the cast 
just below the position of the suture line, and entirely absent on the outer 
half of the body whorl, as seen on the individuals in hand. 
This species is of about the size of A. pennata Morton and has very 
nearly the same apical angle. The vertical folds are, however, rather more 
distant, the body whorl larger in proportion, and the spire rather shorter 
generally; but the principal difference is in the form of the body volution, 
in the existence of the rounded ridge leading to the posterior projection, and 
in the flattening below. No evidence of spiral lines or ridges exist on any 
of the specimens which I have examined. 
Formation and locality: Tn the Lower Green Marls, at Mullica Hill and 
Upper Freehold, New Jersey. In the collection at Rutgers College and at 
Columbia College. 
