34 PALEONTOLOGY OF NEW YORK. 



SOLOFKA; and in the 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 ?) PRIMiEVUS. 



PLATE XII, FIGS. 1-3. 



ilacrocheiltu t primmvwi, 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. 28, AND PLATE XIX, FIG. 1. 



PleuroUmtaria Doris, Hall. Descriptions of New Species of Fossils, etc., p. 15. 1861. 



" " " Fifteenth Rep: N. Y. State Cab. Nat. Hist., p. 43, pi. !>, 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-thirds the width across the base of the shell. Volutions, three 

 or four, gradually expanding, — their elevation above the suture-line being 



