﻿CARBONIFEROUS SERIES OF THE WESTERN STATES. 77 



backwards. The remainder of the surface is smooth. The aperture is nearly semi- 

 circular. Length, seven tenths of an inch ; breadth, nearly the same. 



Geological Position and Locality. — This species was found by Major T. C. Downey, 

 in the coal measures, one mile south of New- Harmony, Indiana, the only locality in 

 which it has yet been discovered. 



Explanation of the Figures. — PL IX. fig. 10, a. Front view, showing the aperture. 



Fig. 10, b. Back view of the same. 



Illinois State Collection. 



LOXONEMA. 



L. Hallii, nob. — PI. IX. fig. 11, a, b. 



Shell of medium size ; elongated. Length, one inch and eight-tenths ; breadth, 

 six tenths of an inch. Opening of the spiral angle 22°. Whorls ten, flattened, or 

 only swelling out at the upper part, producing a deep suture between them ; they are 

 covered with slightly raised transverse ridges. Mouth long and narrow, three times 

 as long as broad, and terminating below in a shallow groove or notch, not prominently 

 marked except in well-preserved specimens. 



Geological Position and Localities. — This species has only been found in the coal 

 measures. It is very abundant on the Wabash, five miles below New Harmony, 

 Indiana, in the clay shales of that formation. It also occurs at Galatia, Saline county, 

 Illinois, in equivalent beds. 



Explanation of the Figures. — PI. IX. fig. 11, a. Front view of a large specimen. 



Fig. 11, b. Back view of the same. 



Illinois State Collection. 



We take great pleasure in dedicating this new species to the eminent American 

 palaeontologist, Prof. James Hall, of Albany, New York. 



New Harmony, .Indiana, January 23</, 1855. 



