Permo-Carboniferous Ammonoids of the Glass Mountains 227 



Plate VIII. 



Pig. 1-10. .Perrinites vidriensis nov. gen. nov. sp. — Zone of Perrimites (Leonard 

 formation). — Two miles northwest of Iron Mountain, Glass Moun- 

 tains. 



Fig. 1, front ; fig. 2, side view ; fig. 3, venter ; fig. 4, external saddle 

 of large specimen; natural size. 



Fig. 5, side view ; fig. 6, venter ; fig. 7, external suture of medium- 

 sized specimen ; natural size. 



Fig. 8, side view; fig. 9, venter; fig. 10, front, of a specimen found 

 in lower part of zone of Perrinites at three miles north of the old 

 oil derrick in Wedin 's ranch. Glass Mountains. 



