LOWER HELDERBERG ROCKS, 
Loxononia ? obtusa (n.s.), 
Plate LIY. Fig. 10, 
Shell elongate, terete, very gradually tapering, subobtuse at the apex : 
volutions about nine or ten, eight of which are preserved in the speci¬ 
men, gently rounded on the exterior and very gradually diminishing 
in size, the last one being little more ventricose than the one above it. 
Aperture and surface unknown. 
Fig. 10. A longitudinal section of a specimen of this species upon the worn surface of the 
rook. 
Geological position and locality. In the pentajnerus limestone ; Schoharie, 
Loxoiiema? compacta (n. s.). 
Plate LIY. Fig. 12. 
Shell elongate, fusiform, very gently tapering in the lower part, and 
more rapidly towards the apex : spiral very gradually ascending; 
volutions, thirteen of which are preserved in the specimen, gradually 
increasing in size from the apex, the last one scarcely more ventricose 
than the next above, regularly convex upon the exterior, each one 
about twice and a half as wide as high. Surface unknown. 
The specimen is a cast which preserves no surface markings. The last volution 
preserved may not have been the terminal one. 
This species resembles the L. obtusa; but the volutions are proportionally smaller 
and more closely arranged, there being in this one more than eight in the space of 
six of that species. 
Fig. 12. A specimen from which the shell is exfoliated, preserving thirteen volutions with 
the apex imperfect. 
Geological position and locality. In the lower beds of the pentamerus limestone : 
Schoharie county. 
[ Palaeontology III.] 
38 
