^24 ■ University of Texas Bulletin 



Fig. 'i7-56. .Adrianites marathonensis nov. sp. — Zone of Waagenoceras (Word 

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

 tains. 



Fig. 47, venter; fig. 48, side view; fig. 49, front, of largest speci- 

 men found; natural size. 



Fig. 50, side vievr; fig. 51, venter, of smaller specimen; natural 

 size. 



Fig. 52, external suture of specimen illustrated in figs. 47-49, 53- 

 56. Twice natural size. 



Fig. 53, the same in natural size. 



Fig. 54, side view ; fig. 55, front ; fig. 56, venter, of specimen illus- 

 trated in Fig. 47-49, 52, 53. Twice natural size. 

 Fig. 57-69. . Stacheoceras Bowmani nov. sp. — Zone of Waagenoceras (Word form- 

 ation) . — Junction of Gilliam and Eoad canyons. Glass Mountains. 



Fig. 57, side view; fig. 58, front; fig. 59, venter (upper part of 

 fig. 57) ; natural size. 



Fig. 60, part of external suture; the umbilicus on the right side 

 indicates how many lobes are missing. Natural size. 



Fig. 61, side view; fig. 62, cross-section; fig. 63, venter, showing 

 the characteristic ornamentation ; natural size. 



Fig. 64, front; fig. 63, venter; fig. 66, side view, showing trace? 

 of the suture; natural size. 



Fig. 67, venter; fig. 68, side view showing ornamentation; fig. 69, 

 front; natural size, 

 tf'ig. 10-76. .Stacheoceras gilUamense nov. sp.-=— Zone of Waagenoceras (Word 

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

 tains. 



Fig. 70, venter; fig. 71, side view; fig. 72, front; fig. 73, part of 

 internal suture; natural size. 



Fig. 74, front; fig. 75, venter, of the same specimen; twice natural 

 size. 



Fig. 76, side view of another specimen; natural size. 

 Fig. 77-89. .Marathonites J. P. Sviithi nov. subgen. nov. sp. — Zone of Uddcnitcs 

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



Fig. 79, internal and external suture taken from a fairly large 

 specimen. The umbilical seam coincides with the straight limit 

 between the black and white. Natural size. 



Fig. 80, the same ; twice natural size. 



Fig. 81, side view; fig. 82, front; fig 83, venter; fig. 78, external 

 suture of largest specimen found ; natural size. 



Fig. 84, side view; fig. 85, cross-section; fig. 86, venter; fig. 77, 

 external suture; natural size. 



Fig. 87, venter; fig. 88, front; fig. 89, side view; natural size. 



