122 KANSAS UNIVERSITY SCIENCE BULLETIN. 



copsis remex, N. shumardif, Euomphalus subquadratus , E. 

 undetermined, Murchisonia and Patella both undetermined, 

 Bellerophon crassus, B. montfortianus and one undetermined, 

 Sedgivickia topekaensis, Pleurophorun undetermined, Clidophorus 

 occidenfalis, Yoldia subscitula, Myalina permiana, M. avicidoides, 

 M.perattenuata, Gervillia longa, Aviculopectea occidentalis, Syr- 

 ingopora, Spirorhi^ undetermined, and Cythere nehrascensis ." 



Concerning Ptychites cum'ininsi and Popanoceras walcotti, he 

 remarks, "that if they alone, and without any statement of 

 correlated facts, had been submitted to any paleontologist, 

 he would not have been warranted in referring them to an 

 earlier period than the Trias, if he had followed the usually 

 accepted standard of reference." His conclusion is, after an 

 extended discussion of the Permian and Carboniferous of the 

 world: "The evidence upon which the Texan strata have 

 been referred to the Permian is fuller than that which has 

 been adduced with regard to any other North American strata 

 that have been so referred ; that is, the evidence of both ver- 

 tebrate and invertebrate fossils is in favor of such reference, 

 and the difference in the character of the strata from those of 

 the underlying Coal Measures, although not great, is conven- 

 iently distinguishable. Still, it is true that the Texan Per- 

 mian strata bear many Coal Measure invertebrate species, 

 and its flora is at present unknown." Mtdlicottia copei, Pty- 

 chites cumminsi and Popanoceras walcotti are described and fig- 

 ured in this paper. They are characteristic Permian fossils. 



In 1891 White republished the fauna just referred to, with 

 descriptions of all the species, and giving four plates of illus- 

 trations. The discussion is much the same as was given in 

 the former paper, with some additions, and a general section 

 figured on page 14.^" The list as revised is as follows : 

 Goniatites baylorensis White, Waagenocera^ cumminsi White, 

 Medlicottia copei White, Popanoceras walcotti White, Orthoceras 

 rushensis McChes.?, Nautilus winsloiui Meek and Worthen, 

 Nautilus occidentalism Swallow, three undetermined species of 

 Nautilus, N.{EndoU)bus) — f, Natic.opns remex White, N. shum- 

 ardi McChes.?, Euomphalus subquadratus Meek and Wor- 

 then, E. f, Murchisonia f, Patella f , Belter ■•phon 



16. Ball. 77, U. S. Geol. Surv., 1891. 



