132 PALEONTOLOGY OF NEW YORK. 



LOXONEMA BREVICULUM, n. Sp. 

 PLATE XXVIII, FIG. 12. 



Shell somewhat abruptly turretiform. Volutions about five or six, moderately 

 convex, somewhat rapidly expanding near the apex, and more gradually 

 below — the last volution scarcely more ventricose than the preceding. 

 Aperture broadly subelliptical. 



Surface unknown. 



The specimen figured presents a longitudinal section of the volutions, the 

 opposite side having the shell crystalline and exfoliated, but preserving some 

 obscure indications of strong longitudinal curving stria?. From these char- 

 acters, and its general form and association, it is referred to the genus 

 Loxonema. 



Formation and locality. In calcareous concretions in the shales of the Ham- 

 ilton group at Hamburgh, on the shore of Lake Erie. 



Loxonema postremum, n. sp. 



PLATE XXVni, FIG. 13. 



Shell short subfusiform. Volutions about six, moderately convex, the upper 

 ones closely arranged and gradually increasing in size, the last one 

 slightly ventricose and extremely elongated, its length being greater than 

 the entire spire above. Aperture elongate subelliptical, narrowed above. 



Surface marked by strong, scarcely curving longitudinal stria?, which are 

 faintly visible on the last volution in casts of the interior. 



This species is conspicuously distinct from every other in the formations 

 under consideration in the short compact spire, and in the extreme length of 

 the last volution. The shell is crystalline and inseparable from the matrix, so 

 that we are able to obtain only casts of the interior. It is associated with 

 Loxonema laxum and Bellerophon Mara. 



Formation and locality. In some compact semicalcareous beds in the upper 

 part of the Chemung group, at Nichols, Tioga county, N. Y. 



