306 
PALAEONTOLOGY OF NEW-YORK. 
Surface finely striated : strirn making a slight curvature on the sutural 
carina. 
This species differs conspicuously from the preceding, in its very abruptly ter¬ 
minated spire, and the greater lateral extension of the volutions compared with the 
height; in the obtuse carina just outside the suture, and in the form of the aperture, 
which is peculiar. 
The specimen is filled with stone; and it is only the broken edge of the columella 
that can be seen, and which is imperfectly represented in the figure. 
Fig. 1 a. View showing the aperture with the obtuse spire, which is barely visible above 
the second volution. 
Fig. 1 b. View looking upon the spire. 
Geological position and locality. In the upper pentamerus limestone : Helderberg 
mountains. 
Stropliostylus depressus ( n. s.). 
Shell depressed-globose ; height less than the width. Spire flat, or 
scarcely elevated above the outer volution : volutions three or four, 
the last one ventricose and greatly expanded laterally; suture concave, 
the outer volution declining from near the middle of its upper side to 
the suture-line : aperture transverse. 
Surface marked by transverse undulations and scarcely visible striae, 
which are cancellated by fine revolving striae. 
The specimen examined is somewhat imperfect, but presents characters quite 
distinct from either of the others, in its proportions and in the revolving striae. The 
columella, though broken, has the character of others of the genus, as far as can be 
observed. 
Geological position and locality. In the compact layers of the shaly limestone : 
Becraft’s mountain. 
Stropliostylus fitclii (n.s ). 
Plate LXVII. Fig. 2 a - e. 
Shell depressed, somewhat semiglobose. Spire short, scarcely elevated, 
consisting of three or four volutions, the last one becoming extremely 
