234 PALEONTOLO(iY OF NEW JERSEY. 



cast showing irregular undulations transversely, and very strong indications 

 of an apertural slit of undetermined extent near the middle of- the volutions 

 by the existence of a broad undefined elevation with a median impression 

 on the cast. 



This species differs from L. perlata Con. in wanting the flattening on 

 the upper surface of the volution in its greater elevation, stronger volutions, 

 and in the position of the slit. It is perhaps the most bulky gasteropod shell 

 in the New Jersey Tertiary Marls, having a diameter at the base of nearly 

 5J inches in its slightly flattened condition, and would have a height, if 

 complete at the apex, of fully 4 inches. I can not conceive of any distor- 

 tion or compression which would produce from this one the form of volu- 

 lution which characterizes L. perlata. 



Formation and locality: In the upper layers of the Upper Green Marls 

 at Mrs. Haight's pits, Bayley's Corners, Wall Township, New Jersey. Col- 

 lection at Rutgers College. 



Leptomaria pergranulosa, n. sp. 



Plate xxxvi, Figs. 3-6. 



Shell of medium size, very broadly conical in form, having an apical 

 angle of about 125°, and apparently uncompressed; volutions five or more, 

 flattened on the surface in the direction of the spire, or with but a very 

 slight convexity between the suture lines; sutures very distinct but not at 

 all marked; base concave, the lower surface of the volution very gentl}' 

 convex between the acutely angular periphery and the margin of the um- 

 bilical cavity, the latter feature being of moderate width and open to the 

 apex of the spire, showing all the volutions within it ; aperture transversely 

 lenticular in fonn, being acute at the outer and inner margins, and twice as 

 wide as high; slit in the aperture narrow, thread-like, situated nearly mid- 

 way between the upper and lower margins of the volution, or a very little 

 above the middle of the width; surface of the shell, as obtained from an 

 external imprint, entirely granulose or cancellate-granulose, formed by 

 fine, deep, longitudinal lines and nearly equally strong transverse lines. 

 T'hese latter arch gently backward from the upper edge of the volution to 

 the line of the slit, and below it are directed forward to nearly the same 



