34 
PALAEONTOLOGY OF NEW YORK. 
Holopea ; and in tlie absence of satisfactory knowledge of the aperture and 
columella, it is impossible to decide that it may not belong to that genus. 
Formation and localities. In calcareous beds of the Hamilton group, at Pratt’s 
Falls, Madison county, N. Y., and in the arenaceous shales of the same neigh¬ 
borhood; also in the Chemung group at Corning and Painted Post, N. Y. 
MaCROCHEILUS ? (PlEURONEMA ?) PRDREVUS. 
PLATE XII, FIGS. 1-3. 
Macrocheilus ? primCBvus, Hall. Illustrations of Devonian Fossils : Gasteropoda, pi. 12. 1876. 
Shell turreted; upper volutions small, the last one moderately ventricose. 
Aperture undetermined. 
The few specimens seen are essentially casts of the interior, and have the 
appearance of having had a simple striated surface. On one of the specimens 
there are, near the aperture, some remains of simple curving striae of growth 
which have not the peculiar bending of the striae of Loxonema ; nor do they 
resemble those of any species of Pleuronema. Although the material is 
extremely unsatisfactory, it appears to be sufficiently distinct from any other 
species known in the rocks of this formation to deserve notice. 
Formation and locality. In the Schoharie grit, at Schoharie, N. Y. 
CYCLONEMA, Hall. 
Cyclonema Doris. 
PLATE XII,’ FIG. 23, AND PLATE XIX, FIG. 1. 
Pleurotomaria Doris, Hall.. Descriptions of New Species of Fossils, etc., p. 15. 1861. 
“ “ “ Fifteenth Rep. N. Y. State Cab. Nat. Hist., p. 43, pi. 5, f. 6. 1862. 
<< “ “ Illustrations of Devonian Fossils: Gasteropoda, pi. 19. 1876. 
Cyclonema crenistria, Hall. Illustrations of Devonian Fossils : Gasteropoda, pi. 12. 1876. 
Shell very depressed-conical or subglobose, the elevation of the spire being 
about two-tliirds the width across the base of the shell. Volutions, three 
or four, gradually expanding,—their elevation above the suture-line being 
