Permo-Carboniferous Ammonoids of the Glass Mountains 225 



Plate VII. 



Fig. 1-4. .MnratJionites sulcatus nov. subgen. nov. sp.— Zone of Uddenites 

 (Wolf camp formation).— Wolf Camp, Glass Mountains. 

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

 natural s"ize. 

 Fig. 5-32. .Marathonites vidriensis nov. subgen. nov. sp. — Zone of Uddenites 

 (Wolfcamp formation). — Wolf Camp, Glass Mountains. 

 Fig. 5, side view; fig. 6, front; fig. 7, venter; fig. 8, external 



suture ; natural size. 

 Fig. 9, front; fig. 10, venter; fig. 11, side view, of the same speci- 

 men; twice natural size. 

 Fig. 12, front; fig. 13, venter; fig. 14, side view; fig. 15, external 



suture; natural size. 

 Fig. 16, front; fig. 17, venter; fig. 18, side view; natural size. 

 Fig. 20, side view; fig. 21, venter; fig. 22, front, of the same speci- 

 men ; twice natural size. 

 Fig. 23, venter; fig. 24, side view; fig. 25, front; fig. 26, external 



suture; natural size. 

 Fig. 27, side view; fig. 28, front; fig. 29, venter; natural size. 

 Fig. 19, external suture; fig. 30, the same; twice natural size of 



medium-sized specimen. 

 Fig. 31, internal suture, natural size; fig. 32, the same, twice natural 

 size of large specimen. 

 Fig. 3B-39 . .Marathonites Ilargisi nov. subgen. nov. sp. — Zone of ProtJialas- 

 soceras (Hesp formation). — Anticline on Hargis's ranch near 

 Southern Pacific R. R. mile-post 580, near Marathon, Brewster 

 County. 

 Fig. 33, side view; fig. 34, front; fig. 35, venter; fig. 36, external 



suture; natural size. 

 Fig. 37, front; fig. 38, venter; fig. 39, external suture of the same 

 specimen; twice natural size. 

 Fig. 40-61. .Vidrioceras Uddcni nov. subgen. nov. sp. — Zone of Uddenites (Wolf- 

 camp formation). — Wolf Camp, Glass Mountains. 

 Fig. 40, front; fig. 41, venter; fig. 42, side view; fig. 43, external 



suture ; natural size. 

 Fig. 44, front; fig. 45, side view; fig. 46, venter; fig. 47, external 



suture; natural size. 

 Fig. 48, side view; fig. 49, venter; fig. 50, front; natural size. 

 Fig. 51, venter ; fig. 52, front ; fig. 53, side view, of the same speci- 

 men; twice natural size. 



