Permo-Carboniferous Ammonoids of the Glass Mountains 45 



The upper Productus limestone contains also Stacheoceras anti- 

 quum and Popanoceras priscmn, probably the youngest and last mem- 

 bers of these long living genera. Stacheoceras occurs also in the 

 Permian strata of Timor described by Rothpletz {Stacheoceras tri- 

 dens) and in the Chitichun I limestone of the Himalaya {Stacheoceras 

 Trimurti Diener). 



Very little is known about the strata of Woabjilga (Karakorum 

 Pass) where Stoliczka collected ammonites with ceratitic sutures which 

 may belong to Xenodiscus. These strata may not even be Permian, 

 but if they are, they certainly correspond to the upper part of the 

 Productus limestone. 



There is another Permian locality of Asia which contains a great 

 number of ammonoids and which has been known for a long time: 

 Djulfa in Armenia. The fauna has first been described by Abich and 

 later on revised first by Moller and again by v. Arthaber. The fauna 

 contains the following species of ammonoids: 



Gastrioceras Ahichi Moller. 



Gastrioceras sp. ind. 



Hungarites Raddei. Arth. 



Hungarites pessoides Abich. 



Hungarites nov. form. spec, ind- 



Otoceras djoulfense Abich. 



Otoceras tropitum Abich. 



Otoceras Fedoroffi Arth. 



Otoceras trochoides Abich. 

 While both Hungarites and Otoceras are very frequent also in the 

 Triassic, Gastrioceras is a distinctly anthracolitic genus. It is re- 

 markable that one of the species described from Djulfa seems to be 

 much nearer related to the upper Carboniferous and the lowest Permo- 

 carboniferous species than to those which constitute the group of G. 

 Zitteli. The other species may belong to this last named group. It 

 is of some interest that a species which seems to belong either to Hun- 

 garites or to Dalmatites has been found by Udden in a limestone near 

 Shafter, Presidio County, Texas, which certainly is synchronous with 

 our Word formation; it corresponds to some part of the Sosio beds. 

 The species has been determined by James Perrin Smith; through 

 the courtesy of Dr. Smith, I have been able to study the specimen and 



