Permo-Carhoniferous Ammonoids of the Glass Mountains 223 



Plate VI. 



Pig. 1-26. .Affathiceras Frechi nov. sp. — Zone of Uddenites (Wolfcamp forma- 

 tion). — ^Wolf Camp, Glass Mountains. 



Fig. 1, side view ; fig. 2, external suture taken from the same speci- 

 men; natural size. 



Pig. 3, internal suture taken from a large specimen; natural size. 



Pig. 4, side view; natural size. 



Pig. 5, side view ; natural size. 



Pig. 6, side view ; natural size;. 



Pig. 7, side view ; natural size. 



Pig. 8, side view ; fig. 9, venter ; fig. 10, front : natural size. 



Pig. 11, side view; fig. 12, front; fig. 13, venter, of the same speci- 

 men ; twice natural size. Showing the ornamentation. 



Pig. 14, side view; natural size. 



Pig. 15, venter; fig. 16, front; fig. 17, side view; natural size. 



Pig. 18, side view; fig. 19, venter; fig. 20, front, of the same speci- 

 men ; twice natural size. 



Pig. 21, venter; fig. 22, front; fig. 23, side view, of very juvenile 

 specimen; natural size. 



Pig. 24, side view; fig. 25, front; fig. 26, venter, of the same speci- 

 men; twice natural size. 

 Pig. 27-4:6. .AgatJiiceras Girtyi nov. sp. — Zone of WoMgenoceras ("Word forma- 

 tion).- — Junction of Gilliam and Koad canyons, Glass Mountains. 



Pig. 27, side view ; fig. 28, front ; natural size. All the septa which 

 on the side view nearly resemble ribs, on this and the following 

 specimens, are internal septa of the next larger whorl. The orna- 

 mentation seen in these with exception of figs. 39-42 is shown from 

 the opposite side and belongs to the interior of the next larger 

 whorl, the ribs showing as furrows and the furrows as ribs. 



Pig. 29, front of the same specimen ; twice natural size. 



Pig. 30, side view ; fig. 31, venter ; natural size. 



Pig. 32, venter of the same specimen ; twice natural size. 



Pig. 33, venter ; fig. 34, front ; fig. 38, side view ; natural size. 



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

 men ; twice natural size. 



Pig. 39, venter; fig. 40, side view, of small specimen; natural size. 



Pig. 41, side view; fig. 42, venter, of the same specimen, showing 

 the real ornamentation of the species ; twice natural size. 



Fig. 43, 44, 45, external sutures of different specimens, fig. 45 be- 

 longing to one larger than any of those figured. Natural size. 



Fig. 46, internal suture ; natural size. 



