94 PALEONTOLOGY OF NEW JERSEY. 
flattened in the direction of the spire, or very little convex on the surface, 
and bordered on the lower margins in the cast by a distinct band, which 
forms about one-third of the height; body volution proportionally rather 
more convex in the middle than the others and constricted below, forming a 
beak of moderate length; the height of this volution as seen from the back 
of the outer lip forms, with the beak, rather more than one-half of the 
entire length of the shell; shell marked throughout by distinet vertical 
ridges or folds, more numerous and more closely arranged on the body 
whorl than on those above, except perhaps the apical ones, and have a slight 
backward curvature in the middle in passing from suture to suture; the 
shell also marked by spiral ridges which, on the body volution, are of nearly 
equal strength with the vertical folds, but are invisible on the other volu- 
tions in the specimens used. 
This shell has the same general character as 7. Reileyi, but is much 
less slender and has a proportionally shorter spire; while the surface mark- 
ings are coarser than on that one and the volutions are less numerous. 
There is a peculiar feature pertaining to the band bordering the sutures in 
these two.species, which may be deceptive in its appearance. In shells of 
this group there is often a thickened band of this kind at the upper edge of 
the volutions, but here it seems to be at the lower edge, and in separating 
the volutions of the casts, which I have done in order to ascertain the truth, 
they separate at the lower edge of the band. As the specimens are, how- 
ever, more properly external than internal casts, preserving the external 
markings of the shell, the thickening of the band at the top of the volution 
which would contain more substance may have made its imprint in the 
external substance of the matrix, which would have been filled up from 
within, thereby Jeaving its mark upon the cast at the base of the preceding 
volution, instead of on that to which it really belonged. I see no other 
means of explaining this feature, for if the band really belonged to the volu- 
tion on which it appears, there should be a corresponding band on the body 
of the last volution, which is not the case. 
Formation and locality: In coarse, dark colored Green Marls of the 
Lower Beds at Freehold, New Jersey, in collections made by the late Rev. 
Dr. Reiley of that. place. 
