142 AMERICAN PERMIAN VERTEBRATES 



Fig. 7, fourth metacarpal; Fig. 8, distal caudal vertebrae. Figs. 1-7, No. 655; 

 Fig. 8, No. 658. 



Plate XX. — Casea broilil Williston. Specimen 655. Fig. 1, right 

 humerus, ventral side, with a, distal end; Fig. 2, the same, dorsal side; Fig. 

 3, the same, ulnar side; Fig. 4, right ulna; Fig. 5, right radius; Fig. 6, sacrum 

 and first caudal vertebra, ventral side. 



Plate XXI. — Casea broilil Williston. Specimen 655. Fig. 1, left innomi- 

 nate, outer side; Fig. 2, the same, inner side. //, ilium, is, ischium, pb, pubis. 



Plate XXII. — Casea broilil Williston. Specimen 655. Fig. 1, right 

 femur, dorsal side and distal end; Fig. 2, the same, ventral side; Fig. 3, the 

 same, outer side; Fig. 4, the same, tibial side and proximal end; Fig. 5, 

 right tibia, ventral side and distal end; Fig. 6, the same, outer side and proximal 

 end; Fig. 7, right fibula, dorsal side and distal end; Fig. 8, the same, tibial 

 side and proximal end. 



Plate XXIII. — Casea broilil Williston. Specimen 655. Fig. 1, right 

 hind foot, dorsal side; Fig. 2, right tibiale and fibulare, proximal ends; Fig. 3, 

 right tibiale, inner side; Fig. 4, ungual phalange; Fig. 5, outline of tarsal 

 bones, from plantar side; Fig. 6, sacrum, from above. 



Plate XXIV. — Fig. 1, Trispondylus texensls Williston, right femur, ventral 

 side, with attached proximal end of tibia, two-thirds natural size; Fig. 2, the 

 same, inner side; Fig. 3, Trematops millerl Williston, left femur, ventral side; 

 Fig. 4, the same, inner side; Fig. 5, Captorhinus illlnolensls Williston, left 

 femur, ventral side; Fig. 6, proximal end of same; Fig. 7, distal end of same; 

 Fig. 8, Labidosaurus, species, right femur, ventral side; Fig. 9, distal end of 

 same; Fig. 10, proximal end of same. 



Plate XXV. — Trispondylus texensls Williston. Fig. 1, right humerus, 

 ventral side ; Fig. 2, the same, outer side; Fig. 3, proximal end of radius; Fig. 4, 

 proximal end of ulna; Fig. 5, distal end of radius; Fig. 6, distal end of ulna; 

 Fig. 7, metacarpal and phalanges, as articulated; Fig. 8, metacarpal; Fig. 9, 

 ulnare. 



Plate XXVI. — -Seymourla bayhrcnsls Broili. Skull and anterior verte- 

 brae, from above. 



Plate XXVII. — Seymourla baylorensis Broili. Skull and pectoral girdle, 

 from below. 



Plate XXVIII. — Seymourla baylorensis Broili. Upper figure, skull and 

 pectoral girdle, from the side; lower figure, the skeleton as exposed in the 

 nodule, much reduced. 



Plate XXIX.— Seymourla baylorensis Broili (type of D. anomalus Willis- 

 ton). Fig. 1, right humerus, a, from side, b, from in front; Fig. 2, left tibia, 

 ventral side; Fig. 3, radius; Fig. 4, right femur, from behind; Fig. 5, left 

 femur, from Cacops bone-bed, natural size; Fig. 6, undet.; Fig. 7, left ilium, 

 from without; Fig. 8, posterior dorsal vertebra, from in front; Fig. 9, dorsal 

 centrum, from behind; Fig. 10, dorsal centrum, from in front; Fig. 11, the 



