110 PALEONTOLOGY OF NEW JERSEY. 



individuals rather less; volutions convex, four or five in number, only four 

 in the casts; sutures deeply marked, indicating a comparative!}" thick shell; 

 body volution large, half as long as the entire length of the cast, or some- 

 times three-fifths of the entire length ; base of the body A-olution extended 

 in front; aperture e(|ualing one-half the length of the cast; elongate ellip- 

 tical in outline, acute at the upper angle and the margin extending above 

 the line of the suture where the lip has extended upon the preceding volu- 

 tion; lower margin of the aperture prolonged and narrow; outer margin 

 more convex than the inner; columellar cavity rather large, indicating a 

 strong and thickened columella, which has been smooth and without any 

 indications of folds or markings; surface of the volutions marked by dis- 

 tant but not very strong vertical folds, which are only seen on the internal 

 cast upon careful examination; surface of the shell and features of the lip 

 and posterior canal unknown. 



The casts of this species, although somewhat common at this one 

 locality, are not very readily distinguished from casts of Voltdomorpha Kanci 

 Gabb, with which they occur, and the only reliable features by which they 

 can be distinguished is the total absence of columellar folds or plications 

 and the extension of the aperture upon the preceding volution when the 

 outline of the margin is preserved, which is not uncommon. In size, gen- 

 eral form, and proportions they are very similar, this one being rather more 

 ventricose on the body -solution, especially in the upper lialf of its length. 



Fonuatioji and local if 1/ : In the dark green layers of the lower Green 

 Marls at Crosswicks Creek, New Jersey. Collections at Rutgers College. 

 Collected by Dr. N. L. Britton. 



ROSTBLLARIA FUSIFORMIS, n. sp. 



Plate XIII, Figs. 14, 15. 



Shell small, slender, and fusifoi'ni ; spire elevated and slender, the apical 

 angle being about 20° or 25°; volutions slender, slightly convex on their 

 exposed surfaces ; four only preserved in the cast, but there have been four 

 or five more above, making eight or more in all; body volution greatly 

 prolonged in front, forming a long slender beak with a proportionally strong 



