298 
PALAEONTOLOGY OF NEW-YORK. 
Loxoneiiia planogyrata ( n. s.). 
Plate LIY. Fig. 13. 
Shell extremely elongate, very gradually and evenly tapering to the 
apex : volutions twelve or thirteen (of which ten are preserved in the 
specimen), about twice as wide as high, gradually ascending, depressed 
convex on the exterior or a little flattened on the upper side of the 
lower volutions, the last one scarcely ventricose, with a slight indica¬ 
tion of an obtuse carina towards the base. Surface unknown. 
The specimen figured is the only one seen. The upper volutions are broken off 
or obliterated, and the aperture is imbedded in the stone. It may be recognized by 
its long and slightly convex volutions, the last one of which is nearly flat on its 
longitudinal slope. 
Fig. 13. The anterior side of the specimen, the apex of which, as represented in the figure, 
preserves no marks of volutions. 
Geological position and locality. In the pentamcrus limestone : Schoharie county. 
Murcliisonia extenuata (n. s ). 
Plate LIY. Fig. 15 & 16? 
Shell elongate, attenuate : volutions uniangular; aperture round-ovoid. 
Surface unknown. 
Fig. 15 is copied from a figure of Mr. Conrad, which is cited as from the Ten- 
taculite limestone of Fayetteville, Onondaga county. 
Fig. 16 is a much worn specimen, which is perhaps of the same species. 
Geological position and locality. In the tentaculite limestone of Schoharie and 
Onondaga counties. 
Murchlsonla in inula (n. s ). 
Plate LIY. Fig. 17. 
Shell minute : spire elongate, gradually attenuate; volutions about nine 
or more, rounded, bicarinate. Aperture and surface unknown. 
Figures 17 are representations of the specimen, natural size and enlarged, from 
figures by Mr. Conrad*. 
Geological position and locality. In the tentaculite limestone : Fayetteville, Onon¬ 
daga county. 
* When these and some other figures of Mr. Cox it ad were copied on Plate liv, I had hoped to be able 
to procure the specimens for final description, from the cabinet of the late Mr. Vanuxem. The sale of this 
collection, and its removal to Tennessee, has prevented the fulfilment of this intention. 
