CONTENTS 



Page 



Preface : 'i 



List of Literature Cited .'. 9 



Stratigraphical Part 12 



Stratigraphy of the Periuo-Carboniferous in the Glass Mountains, Th? 



different beds and their faunas 12 



Distribution of the Ammonoids in different Formations 14 



Note on the Age of the Gaptank Formation, by J. W. Beede 18 



Correlation of the Permo-Carboniferous of the Glass Mountains with 



other North American Formations 2 ) 



Correlation with European and Asiatic Beds 25 



Paleontological Part 51 



Prolecanitidae Hyatt 51 



Prolecanitinae Freeh 51 



Daraelites Gemm 51 



Daraelites texanus n. sp 52 



Noritinae Karpinsky 55 



Uddenites nov. gen 55 



Uddenites Schucherti n. sp ....... 60 



Uddenites minor n. sp 63 



Medlicottinae Karpinsky 67 



Medlicottia Wa.agen 67 



Medlicottia Whitneyi n. sp 72 



Medlicottia Burckhardti n. sp. . . . . . ■ : 76 



Glyphioceratidae Hyatt 82 



Gastrioceras Hyatt 82 



Group of Gastrioceras globulosum M. a. W . 83 



Gastrioceras modestum n. sp 83 



Group of Gastrioceras Zitteli Gemm : 85 



Gastrioceras roadense n. sp 85 



Gastrioceras altudense n. sp 88 



Gastrioceras sp. nov. indet 90 



Schistoce^as Hyatt and J. P. Smith 92 



Sehistoceras Smithi n. sp 93 



Schistoceras diversecostatum n. sp 96 



Paralegoceras Hyatt 99 



Paralegoceras incertum n. sp 100 



Thalassoceratidae Hyatt 102 



Prothalassoceras nov. gen 102 



Prothalassoceras Welleri n. sp 101 



Tropitidae Mojsisovics 107 



Celtitinae Mojsisovics 107 



Paraeeltites Gemm 107 



Paraceltites multieostatus n. sp 108 



Paraceltites aff . elegans Girty 110 



Arcestidae Mojsisovics 113 



Popanoceratinae Hyatt 113 



Agathiceras Gemmellaro 113 



Agathiceras Frechi n. sp • . • 114 



Agathiceras Girtyi n. sp 117 



