156 CHARLES S. PROSSER 



meeting of the American Association for the Advancement of Science, 

 in December, 1908. It is too late to discuss or make use of these 

 papers in this article. It may be said, however, that Dr. Girty 

 states that "the propriety of employing the term Permian in the 

 geology of North America seems to me decidedly doubtful, at least 

 in so far as the evidence of invertebrate fossils is concerned."' Mr. 

 White, on the other hand, discusses, under "the Permian floras," 

 following the account of "the Carboniferous floras," those from the 

 Permian of Prince Edward Island, the Dunkard of southwestern 

 Pennsylvania and West Virginia, the Chase of Kansas, and the 

 Wichita of Texas, all of which he apparently places in the Permian. 

 These will be followed immediately by another correlation paper on 

 "The Faunal Relations of the Early Vertebrates" by Professor 

 Samuel W. Williston.^ Later will appear a critical review of "The 

 Guadalupian Fauna,"^ and a correlation article on "The Bearing of 

 the Stratigraphic History and Invertebrate Fossils on the Age of the 

 Anthracolithic Rocks of Kansas and Oklahoma, "^ both of which are 

 by Dr. J. W. Beede. Finally, it may be said that Dr. Beede has 

 studied the stratigraphy, distribution, and invertebrate paleontology 

 of the Upper Paleozoic or Anthracolithic deposits from Nebraska to 

 Texas more thoroughly than any other geologist has yet done and, 

 therefore, his conclusions are entitled to most careful consideration. 

 July 24, 1909 



While this article is passing through the press certain additional 

 information has reached me. The following letter from Professor 

 Yakowlew is important since it gives a summary of the present opinion 

 of the Russian geologists concerning the classification of the Artinsk: 



InsTiTUTE OF Mines, St. Petersburg 

 November 30, 1909 

 Professor Ch. S. Prosser, Ohio State University, Columbus, Ohio: 



Dear Sir: You ask me some questions concerning the Upper Paleozoic 

 deposits of Russia. You wish to know where I draw the line between the Carbon- 

 iferous and Permian systems in Russia and in which system I place the Artinsk. 



I Jour. Geol., Vol. XVII, July, 1909, p. 319. 



^ Ibid., pp. 389-402. 3 Ibid., pp. 672-79. 



-^ Ibid., pp. 710-29. 



