224 R. T. Hill—Outlying Areas of the Comanche 
Gryphea forniculata White. 
Avicula leveretti Cragin. 
Inoceramus comancheana Cragin. 
Of the fifteen recognized species common to both the 
Kansas and Texas regions all occur in the Washita division of 
Texas and eleven are found only init. The Fredericksburg 
fossils reported by him with the exception of one little known 
fossil hitherto reported only from the Caprina limestone of the 
Fredericksburg (Zrochus tecana Roemer), are all of species 
which in Texas also occur in the Washita division. These 
species are as follows: Exogyra texana Roemer, Sphenodiscus 
sp. Cragin, Schlenbachia peruviana von Bueh, and Zrigonia 
emoryt Conrad. In all the writer’s years of labor and study 
of the region he has never seen Zregonza emoryz in the beds 
of the Fredericksburg division, and although so reported by 
the Texas Geological Survey, he does not believe it occurs 
there, while it is common, abundant and widely distributed in 
the beds of the Washita division. 
The Sphenodiscus from the Belvidere beds may possibly be 
confused with S. pedernalis Roemer, of the Fredericksburg 
division. A large number of undescribed species belonging 
to this group of Ammonites occur in the Comanche Series 
from the Glen Rose through the Washita division. The: 
writer has observed these differences for years and submitted 
the species to eminent authorities. It can only be said now, 
as Mr. Stanton has already said, that the Sphenodiseus of the 
Belvidere beds—a figure of which without description has 
been published by Cragin*—is not S. pedernalis of Roemer. 
On the other hand, some of the Belvidere specimens seem to 
resemble species occurring in the Denison beds of the Washita 
division. 
This leaves only two undoubted species common to the 
Fredericksburg and Washita in the Belvidere beds. These 
are Lixogyra tecana Roemer, and Schlenbachia peruvianus vou 
Buch. 
Hauogyra tecana Roemer is found to range upward into the 
Washita division in New Mexico, in Trans Pecos, Texas, and 
at El Paso, but the writer, in the course of his extensive 
observations, has never seen it in Central Texas above the 
Fredericksburg division. While this form usually has a well 
defined zone of abundance in the Walnut clays at the base of 
the Fredericksburg division, it really has a wide vertical range, 
occurring in the underlying Glen Rose and the upper beds of 
the Caprina limestone in the Austin region and associated with 
a Fort Worth fauna at Frontera, three miles west of El Paso. 
* The Neocomian of Kansas, American Geologist, 1894, Plate I, fig. 4. 
