APPENDIX 



ON SOME NEW AMMONOIDS AND THE SUCCESSION OF THE AMMONOID- 



BEARING HORIZONS OF THE PERMO-CARBONIFEROUS 



IN CENTRAL TEXAS. 



After the plates for the present work had been finished and the 

 printing of the text begun, Dr. J. W. Beede, of Austin, sent me two 

 small collections of Permo-Carboniferous ammonoids. One of these 

 were collected by Mr. W. E. Wrather in 19 14, in beds about 200 

 feet below the top of the Wichita formation, four miles south of 

 Dundee, Baylor County, Texas. Mr. Wrather considers this horizon 

 as being somewhat lower than the one of the old Military Crossing in 

 the same county, where W. F. Cummins collected,the material later on 

 described by Dr. Charles A. White. 



The other collection was made by Dr. Beede himself on the Colorado 

 River, in western Runnels County, Texas, about four miles east of 

 the western county line and 300 feet below the top of the Clear Fork 

 beds. Dr. Beede considers this horizon as being approximately 675 

 feet higher than the one which contains the fossils described by Chas. 

 A. White. 



Unfortunately, the printing of the present paper is so far advanced 

 that I cannot include here a description dnd illustrations of these 

 fossils, but I have carefully studied them and drawn the sutures, and 

 can at least add the main results I obtained, hoping that I may be able 

 to publish later on a detailed description with the necessary illustra- 

 tions of these new ammonoids and perhaps of some more material. 



The stratigraphically older horizon found by Mr. Wrather four 

 miles south of Dundee contains the following ammonoids : 



Medlicottia n. sp. (aif. M. artietisis Gruenew.) 



Perrinites n. sp. (aff. P. Cumminsi White) 



Stacheoceras {Marathonitesf) n. sp. (aff. St. Romanowskyi Karp.) 



Agathiceras sp. ind. (aff. A. uralicum Karp.) 



The fauna is entirely different from the one described by Chas. A. 

 White and possibly slightly older. To show this we shall have to dis- 

 cuss every one of the species a little more in detail. 



