GASTEKOPODA OF THE LOWER GREEN MARLS. 57 



elongated, pointed above and below, not exceeding one-half the length of the 

 entire shell; extension of the beak unknown, but apparently short; surface 

 of the volutions marked on the cast by remains of closely arranged, not 

 very strong, flexuose, vertical lines or folds, which have been directed 

 strongly forward in crossing the volution from above, and become obsolete 

 before reaching the middle of the volution on the cast, not visible in any 

 degree on the body whorl; the body volution also preserving distinct evi- 

 dences of moderately strong, revolving lines, which on the specimens used 

 for description are a little more than a sixteenth of an inch distant on the 

 central portions, where they are parallel to the suture line above, while 

 those below the middle diverge more rapidly and are more oblique. 



This shell is so entirely distinct from any other noticed from the New 

 Jersey beds that there is scarcely a possibility of mistaking it. It differs 

 also in proportions and form from any of those described by Meek and 

 Hayden from the upper Missouri region so decidedly as not to be readily 

 confounded with them. There are remains of a very closely allied form 

 from Alabama, but, so far as I am aware, it is undescribed. There is less 

 angularity of the volutions than is common among the representatives of this 

 section of the group already described, and it apparently had a shorter 

 beak than is common among them. Still, I see no reason for considering it 

 as generically distinct from the group Nej)timella as defined by Mr. Meek, 

 so far as can be determined from the internal casts only, unless it be in the 

 length of the spire being fully as great as that of the aperture, which I can 

 hardly think ought to be a generic feature, although Mr. Meek gives it so 

 in his generic diagnosis. 



Formation and locality: From the ferruginous layers of the lower Marls, 

 at MuUica Hill, New Jersey. One of the specimens is from the collection of 

 the Acad. Nat. Sci., Phila., and the other from that at Rutgers College. 



