40 
PALAEONTOLOGY OF NEW YORK. 
LoXONEMA ? SUBATTENUATA. 
PLATE XIII, FIGS. 1-6. 
Loxonema ? subattenuata, Hall. Descriptions of New Species of Fossils, etc., p. 24. 1861. 
“ “ “ Fifteenth Rep. N. Y. State Cab. Nat. Hist., p. 52. 1862. 
“ “ “ Illustrations of Devonian Fossils: Gasteropoda, pi. 13. 1876. 
Shell turretiform, elongate; spire somewhat rapidly ascending. Volutions six 
or more, moderately convex, gradually expanding from the apex, the last 
one somewhat ventricose towards the aperture. 
Surface unknown. 
A cast of a species having proportions nearly similar to Murchisonia Maia 
occurs in the Schoharie grit; but the shell has tapered somewhat more rapidly, 
the volutions are more ascending and less convex, and the form of the aperture 
is subovate and narrowed below. In one specimen the length from base of 
aperture to top of the sixth volution is one inch and three-fourths, and the 
diameter of the last volution is about five-eighths of an inch. A larger indi¬ 
vidual, referred to the same species, has a length of two and a quarter inches. 
In this species the volutions are less rapidly ascending, and the spire less 
attenuate than in L. attenuata of the Lower Helderfeerg group, which in many 
respects it resembles. 
Formation and locality. *In the Schoharie grit at Schoharie, N. Y. 
Loxonema robusta. 
PLATE Xni, FIGS. 4, 5, 6. 
Loxonema robusta, Hall. Descriptions of New Species of Fossils, etc., p. 24. 1861. 
“ “ Fifteenth Rep. N. Y. State Cab. Nat. Hist., p. 52. 1862. 
“ “ “ Illustrations of Devonian Fossils: Gasteropoda, pi. 13. 1876. 
Shell robust, terebriform ; spire rapidly ascending. Volutions moderately con¬ 
vex, the last slightly more ventricose, with a diameter of nearly an inch. 
The length from the base of the aperture to the summit of the fourth volu¬ 
tion, in a specimen which has been compressed, is three inches, and in a more 
rotund specimen the same number of volutions measure a little less than three 
inches; above this there have probably been three or four volutions to the 
summit, adding to the length about three-fourths of an inch. 
