44 PALEONTOLOGY OF NEW YORK. 



LiOXONEMA HYDRAULICA. 



1'LATK XIII, FIG. 14. 



LoxoneiHt hydraulica, H. & W. Twenty-fourth Rep. N. Y. State Mus. Nat. Hist., p. 193. 1872. 



•« •• Twenty-seventh Rep. N. Y. State Mus. Nat. Hist., pi. 13, f. 15. 1875. 



•• " - Illustrations of Devonian Fossils: Gasteropoda, pi. 13. 1876. 



Shell turreted. Volutions rounded, six in the length of one inch and a quarter 

 from the base ; greatest convexity about the middle of each ; upper 

 ones unknown. Suture deep, giving a constricted aspect at the junction 

 of the volutions. 



Surface marked with distinct, angular stria?, bending gently backward from 

 the suture to the periphery, and with a longer forward curve to the base 

 of each volution ; those of the last volution bending more abruptly back- 

 ward, and making a second abrupt retral curve to the columellar lip. 



This species, in the rotundity of the volutions, and the constriction at the 

 suture, contrasts with all the other species here described. 



Formation and localities. In the hydraulic beds of the age of the Upper Hel- 

 derberg group, at Louisville, Ky. Communicated by Dr. James Knapp. 



LOXONEMA ? COAPTA. 



PLATE XIII, FIG. 7. 



Loxonema coapta, Hall. Illustrations of Devonian Fossils : Gasteropoda, pi. 13. 1876. 



A fragment, preserving about six volutions, has a length of a little more 

 than three-fourths of an inch. The volutions are close, very gradually ascend- 

 ing, and slightly convex on the exterior. The surface is unknown. 



The specimen figured, in its form, rate of increase from the apex, and slightly 

 convex surface of the volutions, presents characters which distinguish it from 

 any one in this geological horizon. 



Formation and locality. In the Crinoidal limestone of the Hamilton group 

 at Eighteen-mile creek, in Erie county, N. Y. 



