Permo-Carboniferous Ammonoids of the Glass Mountains 231 



Plate X. 



Fig. 1-21. .Perrinites vidriensis nov. gen. nov. sp. — Zone of Perrimtes (Leon- 

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

 Mountains. 



Fig. 1, front; fig. 2, side view; fig. 3, venter; natural size. 



Pig. 4, venter ; fig. 5, side view ; fig. 6, front ; natural size. 



Fig. 7, front; fig. 8, venter, of the same specimen; twice natural 

 size. 



Fig. 9, venter; fig. 10, front; fig. 11, side view; natural size. 



Fig. 12, front ; fig. 13, venter, of the same specimen ; twice natural 

 size. 



Fig. 14, venter; fig. 15, side view; fig. 16, front; natural size. 



Fig. 17, venter; fig. 18, front, of the same specimen; twice natural 

 size. 



Fig. 19, external suture of a small specimen; natural size. 



Fig. 20, external suture of a specimen about 3 nun. in diameter, 

 Shumardites stage; four times natural size. 



Fig. 21, internal suture (partial) of medium-sized specimen, nat- 

 ural size, showing the antisiphonal, two lateral and one auxiliary 

 lobe, the internal saddle, the two lateral and one auxiliary saddle. 

 Fig. 22-27. .Perrinites compressus nov. gen. nov. sp. — Zone of Perrinites, lower 

 part (Leonard formation). — Near top ridge about two miles north 

 65 degrees west of Wolf Camp, at head of valley leading down to 

 tank one half mile west of Wolf Camp, Glass Mountains. 



Fig. 22, side view ; fig. 23, venter ; fig. 24, front ; fig. . 25, part of 

 external suture; fig. 26, siphonal lobe and external saddle of an- 

 other suture a little nearer to the living chamber of the same 

 specimen; natural size. 



Fig. 27, side view of another specimen ; natural size. 

 Fig. 28-31. .Waagenoceras Dieneri nov. sp. — Zone of Waagenoceras (Word form- 

 ation). — Glass Mountains. 



Fig. 28, internal suture (partial), natural size, showing the anti- 

 siphonal and the first and second lateral lobes, the internal and 

 the two lateral saddles. From specimen illustrated in Plate XI, 

 fig. 1-3. Junction of Gilliam and Road canyons. 



Fig. 29, side view of largest specimen found; fig. 30, cross-section; 

 fig. 31, siphonal and first lateral lobe, external and first lateral 

 saddle, natural size. Mountain north of Leonard Mountain. 



