GASTEROPODA OP THE LOWER GREEN MARLS. 141 



Found loose at Cliffwood, New Jersey, by Prof. Lockwood, and now in the 

 collection at Columbia College. 



SCALARIA ? PAUPERATA, n. Sp. 



Plate XVIII, Figs. 3-7. 



Shell of medium size, turbinate, with extremely rounded volutions, 

 separated by very distinct and deeply marked sutures. Spire elevated, the 

 apical angle about 70°, and the volutions about four in number; the last 

 forms about one-half of the entire height of the shell, and is thickened 

 below by a strong callus which covers the umbilicus and connects the base 

 of the volution with the lip of the aperture; aperture ovate, rounded below 

 and slightly more pointed above, with the inner margin less strongly curved 

 than the outer. Surface of the shell, as seen on an imperfect specimen, 

 marked by vertical varices which have numbered about eleven or twelve 

 to the volution, are very low and subdued and scarcely lip-like in their 

 nature, but are marked on their surfaces by a row of pits which correspond 

 to a series of narrow, flattened, spiral bands, which are themselves separated 

 from each other by spaces about as wide as the bands. Ten of these flat- 

 tened bands may be counted on the exposed part of the penultimate whorl. 



The casts of this species, several of which have been observed, resemble 

 mtich the internal easts of a Limafia, but have a much larger umbilicus than 

 any of those of that type associated in the same beds. They are palu- 

 dingeform in shape, with the last volution somewhat expanded just at the 

 aperture, and of an ovate form. The suture between the volutions are quite 

 wide in the lower part, but much less so near the apex, and the surface is 

 smooth, being destitute of the imprints of the varices or spiral striae, and 

 would be very readily mistaken for those of the casts of a Naticoid shell. 

 I am somewhat in doubt as to the correctness of its reference to Scalaria, 

 but the entire peristome, as indicated by the cast, and the surface mark- 

 ing shown on a portion of the partial cast, together with the solid axis 

 of the shell, preclude its reference to any other genus or group with which 

 I am acquainted. The elevation of the spire is much less than is usual 

 among the Scalariidce, but there are several forais known, both fossil and 

 recent, which come very near it, and some quite as extreme. 



