﻿71 NORWOOD AND PllATTEN, NOTICE OF FOSSILS FROM THE 



BELLEROPHON. 



B. PERCARINATUS, Conrad. Plate IX. fig. 4, a, b, c. 



This very beautiful shell, which was figured and described by Mr. Conrad in 1842, 

 in the Journal of the Academy of Natural Sciences, old series, is figured here on 

 account of its position in the coal measures of the west, as well as the greater size to 

 which it attains in western localities. 



Geological Position and Localities. — Found at Graysville, Illinois, and in Posey 

 county, Indiana, five miles below New Harmony, in clay shales belonging to the coal 

 measures. 



Explanation of the Figures. — PL IX. fig. 4, a. Specimen of the natural size. View 

 of the back. 



Fig. 4, b. View of the mouth of the same- 



Fig. 4, c. The same, seen in profile. 



Illinois State Collection. 



B. Montfortianus, nob. — Plate IX. fig. 4, a. b, c. 



This species belongs to the same section as the B. Urii of Fleming, being sulcated 

 and not umbilicated. It is rather small, with the exception of the last whorl, the 

 mouth part of which is enormously expanded, both in length and breadth. The 

 shell is crossed from side to side by a series of large, wavy ridges, which are cut 

 through in their centre by a deep longitudinal furrow. The ridges and furrow become 

 obsolete on the expansion of the mouth. The entire surface is covered with fine 

 longitudinal ribs, so numerous that it is almost impossible to number them. The 

 mouth is, apparently, without a notch ; exterior lip semicircular ; inner lip very much 

 thickened, and, with the central parts, projects so far forwards as to form with the 

 sides of the shell two semicircles. 



Geological Position and Localities. — This is another most beautiful species belonging 

 to the coal measures, and is found associated with the B. percarinatus and B. Urii at 

 Galatia, Illinois, and five miles from New Harmony, Indiana. 



On account of the extreme thinness and great expansion of the mouth, no entire 

 specimen has been met with. The dotted outline has been given from an internal 

 mould of the mouth which we were so fortunate as to obtain. 



Explanation of the Figures. — PL IX. fig. 5, a. View of the back of an adult indi- 

 vidual. 



Fig. 5, b. View of the mouth of the same. 



Fig. 5, c. The same, seen in profile. 



Illinois State Collection. 



Named in honor of the founder of the genus. 



