LOWER HELDERBERG ROCKS. 297 



LoYOiieiiia? obtusa ( n. s.). 



Plate LIV. 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 

 rock. 



Geological position and locality. In the pentamerus limestone : Schoharie. 



Loxoneiiia? coiiipacta ( n. s.). 



Plate LIV. Fia. 12. 



Shell elongate, fusiform, very gently tapering in the lower part, and 

 more rapidl}-- 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 tlie lower beds of the pentamerus limestone : 

 Schoharie county. 



[ PAL^ONTOLOaY III.] 38 



