132 
PALAEONTOLOGY OF NEW YORE. 
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 striae. 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 p.ostremum, n. sp. 
PLATE XXVIII, 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 strise, 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. 
