Permian Fot 
of Texas. 
The following is a list of all the invertebrate species which are 
now known to have been found in the Texas Permian, all of 
which are discussed on following pages. The list is presented in 
tabular form for the purpose of giving a synoptical view of the fau- 
na, so far as it is at present known, and also to indicate the locali- 
ties at which the respective species have been discovered, as well 
as their inter-association there. As to the latter condition, it is 
proi>er to state that specimens of all the species found at the local- 
ity which is indicated as the Military Crossing, were collected by 
myself from a single stratum, where they were found commingled 
in such a manner as to leave no doubt as to their having been all 
members of one and the same contemporaneous fauna. Specimens 
of the greater part of the other species were also collected by 
me at the localities indicated. 
LIST OF SPECIES. 
3. Medlicottia copei n. s 
5- Orthoceras rushensis McChesney ? 
13. N. shumardi ^[cChesney ? 
21. Sedgwickia topekaensis Shumard s] 
22. Pleurophorus ? 
23. Clidophorus occidentalis Geinitz . . 
