210 PALEONTOLOGY OF NEW JERSEY. 



the middle of the length of the aperture. Surface of the shell smooth, or 

 marked only by lines of growth. 



The species very closely resembles the living V. scapha in size, form, 

 and proportions. The folds on the columella are similar in distance and 

 probably the same in number. The specimen showing them is too imper- 

 fect to determine their exact number positively, but four only are satisfac- 

 torily shown. It differs from V. vesta herein described in its more angular 

 and obconical form, and can not be easily mistaken for it. 



Formation and locality: In the uppermost layers of the Upper Glreen 

 Marls, at Shark River, New Jersey. From the collection at Rutgers College. 



VoLUTA (Amoeia) vesta, n. sp. 



Plate XXXII, Figs. 4-6. 



Shell large and somewhat cone-shaped, being largest at the base of the 

 spire and iiTCgularly decreasing in size below, with a very little swell or 

 convexity on the sides of the body volution, relieving the otherwise strictly 

 conoidal form. Spire low-conical, the apical angle being about 90°, and 

 the volutions of the spire barely convex between the sutures, which are 

 only moderately indicated in the cast, but which appear to have been 

 slightly callus in the shell. Aperture large, apparently contracted below. 

 Columella moderately strong, but little if at all callus and marked by four 

 rather strong and very distant folds, with flattened spaces between, which 

 in tlie specimen figured is fully three-eighths of an inch wide between the 

 upper ones. The upper fold is nearly horizontal and the lower very 

 oblique, being nearly vertical and nearly at the base of the columella. 

 Surface of the shell smooth or marked only by fine lines of growth parallel 

 to the margin of the aperture. 



This species is peculiar for its conoidal form and peculiar columellar 

 folds, these latter being very unusually distant and isolated in their posi- 

 tion. The surface of the shell is entirely destitute of any longitudinal or 

 vertical folds or undulations of the surface, and I do not think there has 

 been any markings of any kind other than the lines of growth. The 

 shell has apparently attained a very fair size, the specimen figured having 

 measured fully 5 inches in length when perfect. The shell has had the 



