42 
PALAEONTOLOGY OF NEW YORK. 
LOXONEMA ? TERES. 
PLATE XIII, FIG. 10. 
Loxonema teres, Hall. Illustrations of Devonian Fossils: Gasteropoda, pi. 13. 1876. 
Shell turretiform. Volutions seven or more, gradually enlarging from the 
apex, the last one moderately ventricose, and all gently rounded on the 
periphery. 
The specimen is essentially a cast of the interior, retaining some portions of 
the shell in a crystalline, condition. The general aspect of the cast is that of 
Loxonema, and it is thus referred with some doubt. It is slightly fusiform, the 
upper volutions being proportionally more contracted than those below. The 
greatest diameter of the last volution is about equal to the height of the suc¬ 
ceeding three volutions. 
This form bears much resemblance to the L. subattenuata, but the volutions 
are a little more closely enrolled and slightly more convex on the periphery. 
It is possible, however, that a greater number of specimens may show a grada¬ 
tion, uniting these forms as a single species. 
Formation and locality. In limestone of the Upper Helderberg group, at Clar¬ 
ence Hollow, Erie county, N. Y. 
Loxonema pexata. 
PLATE XIII, FIGS. 16, 18(11,12?). 
Loxonema pexata, Hall. Fourteenth Rep. N. Y. State Cab. Nat. Hist., p. 104. 1861. 
“ “ “ Illustrations of Devonian Fossils: Gasteropoda, pi. 13. 1876. 
Shell elongate, terete or subfusiform. Volutions six or more, gradually 
expanding from the apex, somewhat flattened on the upper half, or a little 
concave just below the suture, and most convex below the middle; the 
last one moderately ventricose. Aperture subelliptical. 
Surface marked by strong, regular, elevated striae, which cross the volutions 
in a gentle curve, turning backward from the suture and again forward, 
making the curve at about oiie-tliird of the distance from the upper side 
