118 PALEONTOLOGY OF NEW JERSEY. 



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 difi'erence 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 S2Diral lines or ridges exist on any 

 of the specimens which I have examined. 



Formation and locaVdij : In the Lower Grreen Marls, at MuUica Hill and 

 Upper Freehold, New Jersey. In the collection at Rutgers College and at 

 Columbia College. 



