no University of Texas Bulletin 



Paraceltites elegans Girty^ has a lesser number of ribs, which on 

 the outer whorl seem to become more sigmoidal. It is somewhat dif- 

 ficult to compare both species because Girty gives only an enlarged 

 figure, but there are some features which distinguish our species well 

 from that of the Guadalupian. The cross-section is entirely different ; 

 it is much more elliptical in P. elegans than in ours, and there seems 

 to be a comparatively sharp umbilical border developed, at least in the 

 last whorl ; which is not the case in any of our specimens. 



All the other species of Parceltites described so far are still more 

 different than those cited. 



Age: 



Word formation, Permo-Carboniferous. 



Number of specimens examined: 

 Seven. 



Locality: 



Two and a half miles N 70° E from the second tank above the head- 

 ciuarters ranch of the Hess Ranch, Glass Mountains. 



Paraceltites aff. elegans Girty 

 PI. V, Fig. 33-38 



1908 Paraceltites elegans Girty, Guadalupian Fauna, p. 499, pi. 25, 

 fig. 12-14. 



Among our material there is a fragment which is specifically dif- 

 ferent from all others but which is not complete enough to be described 

 as a new species. Its character is the following: 



Shell discoidal, very evolute, much compressed on the flanks, rounded 

 on the venter; cross-section of the whorl elliptical, much higher than 

 broad. Umbilicus wide without a sharp umbilical border; vimbilical 

 wall not very steep, flanks curving gradually down to the umbilical 

 seam. The outer whorl covers only the smooth part of the venter. 



The sculpture consists of numerous transversal ribs, about twenty- 

 five on the largest whorl and probably about twenty on the next 

 smaller one. The ribs on the largest whorl are prominent, rounded on 



'Girty, Guadalupian fauna, p. 499, pi. 25, flg. 12-14. 



