40 PALAEONTOLOGY OF SEW YORK. 



mediate between thai and L.sinuosa, while the striae are curved as in the latter 

 species. Tin- figures <>t' I'liii.i.ii's represent the striae a little curved backwards 

 at their upper extremities, with an enlargement just below, — features which 

 our species does not possess. 



Formation and localities. In shales of the Hamilton group, at Seneca and 

 Cayuga lakes; at Eighteen-mile creek; and more commonly in the shales east 

 of Cayuga lake, at Delphi and other places. 



LOXONEMA BELLONA. 



PLATE XIV, FIGS. 3, 4. 5. 



Loxonemi Bellona, Ham.. Illustrations of Devonian Fossils: Gasteropoda, pi. 14. 1876. 

 Loxonema. sp. ? Hall. Illustrations of Devonian Fossils: Gasteropoda, pi. 14. 1876. 



Shell turreted, robust, somewhat rapidly expanding from the apex. Volutions 

 in the entire shell probably nine or ten, convex, the last one ventricose ; 

 columellar lip somewhat rapidly contracted at the base of the volutions, 

 and pointed below. 



Surface marked by distinct, closely arranged, elevated striae, which, for a 

 short distance below the suture, are nearly vertical, and then, bending 

 gently backwards, are recurved upon the periphery at about the middle of 

 the volution. On the last volution the striae are very abruptly recurved 

 to the columellar lip. 



The specimens examined are all imperfect, and essentially casts of the 

 interior, preserving portions of the exterior shell. The general form resembles 

 the L.subattenuata of the Schoharie grit; but the volutions are more rotund ami 

 the last one more ventricose ; these features appear^ more conspicuous in 

 the comparison of specimens than in the figures. This form also resembles the 

 L. teres, but is more rapidly tapering, and the proportion of width and height 

 of the volutions is also a distinctive feature. 



Formition and locality. In some calcareous layers of the Hamilton shales at 

 Bellona, Yates county, N. Y. 



