Permo-Carboniferous Ammonoids of the Glass Mountains 21^ 



Plate II 



Fig. l-3..MedUcattM BurckJiardti nov. sp. — Zone ot. Waagenoceras (Word 

 formation) . — Junction of Gilliam and Road canyons, Glass Moun- 

 tains. 



Fig. 1, venter, showing part of the furrow and keels. Specimen 

 figured in Plate I, fig. 51, 52. Natural size. 



Fig. 2, mature suture of the same specimen ; natural size. 



Fig. 3, part of nearly mature suture of a smaller specimen. 

 Fig. 4:-27 . . Gastrioceras modestum nov. sp. — Zone of Uddenites (Wolfcamp 

 formation). — "Wolf Camp, Glass Mountains. 



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



Fig. 7, venter; fig. 8, side view; fig. 9, front, of the same specimen; 

 twice natural size. 



Fig. 10, front ; fig. 11, side view ; fig. 12, venter ; natural size. 



Fig. 13, venter; fig. 14, front, showing traces of ornamentation; 

 natural size. 



Fig. 15, side view, of the same specimen; twice natural size. 



Fig. 16, side view; fig. 17, front; natural size. 



Fig. 18, side view ; fig. 19, front, showing traces of ornamentation, 

 same specimen ; twice natural size. 



Fig. 20, venter; fig. 21, side view; natural size. 



Fig. 23, venter; fig. 22, side view, of the same specimen; twice 

 natural size. 



Fig. 24, external suture of specimen shown in fig. 4-9 ; natural size. 



Fig. 25, external suture; natural size. 



Fig. 26, external suture of specimen shown in fig. 16-19; natural 

 size. 



Fig. 27, external suture of specimen shown in fig. 20-23. 

 Fig. 28-47. .Gastrioceras roadense nov. sp. — Zone of Waagenoceras (Word form- 

 ation). — Different localities, Glass Mountains. 



Fig. 28, side view of young specimen; natural size. Junction of 

 Gilliam and Road canyons. 

 ' Fig. 29, side view of the same specimen ; twice natural size. 



Fig. 31, side view of young specimen; natural size. Junction of 

 Gilliam and Road canyons. 



Fig. 30, side view of the same specimen ; twice natural size. 



Fig. 32, front; fig. 33, venter; fig. 34, side view of a young speci- 

 men; natural size. Mountain north of Leonard Mountain. 



Fig. 35, side view ; fig. 36, front ; fig. 37, venter, of the same speci- 

 men; twice natural size. 



