EXPLANATION OF PLATES 141 



PLATE IX. Varanosaurus brevirostris Williston. Right innominate. Fig. 

 i, from without; Fig. 2, from within. IL, ilium; 76", ischium; PB, pubis. 



PLATE X. Varanosaurus brevirostris Williston. Pelvis, from below, the 

 lower figure, a photograph, two-thirds natural size. 



PLATE XI. Varanosaurus brevirostris Williston. Pelvis and first five 

 caudal vertebrae, from above. 



PLATE XII. Varanosaurus brevirostris Williston. Fig. i, left femur, 

 ventral side; Fig. 2, the same, fibular side; Fig. 3, the same, tibial side; Fig. 4, 

 the same, dorsal side; Fig. 5, the same, distal end; Fig. 6, left tibia, ventral 

 side; Fig. 7, the same, dorsal side; Fig. 8, the same, fibular side; Fig. 9, the 

 same, inner side; Fig. 10, the same, proximal end; Fig. n, the same, distal 

 end. 



PLATE XIII. Varanosaurus brevirostris Williston. Seymouria baylorensis 

 Broili. Fig. i, Varanosaurus, right foot, dorsal side; Fig. 2, Varanosaurus, 

 right fibula, ventral side; Fig. 3, Varanosaurus, right fibula of another indi- 

 vidual, dorsal side; Fig. 4, Seymouria, anterior vertebra, from the side; Fig. 5, 

 the same, from in front; Fig. 6, Seymouria, posterior vertebrae, from below; 

 Fig. 7, the same, from above; Fig. 8, the same, from the side. 



PLATE XIV. Casea broilii Williston. No. 656. Fig. i, first seven post- 

 cranial vertebrae, a, the odontoid from side and behind, b, the axis from behind; 

 Fig. 2, second presacral (twenty- third postcranial) vertebra from in front, 

 with co-osified ribs, the right also from below; Fig. 3, right mandible, from 

 outer side; Fig. 4, the same from inner side, without articular; Fig. 5, man- 

 dibles, from above. Fig. 6, interclavicle. 



PLATE XV. Casea broilii Williston. Third postcranial vertebra from side 

 and below; eighth to twenty-fourth (first presacral) vertebrae from the side, 

 the fourteenth also from below and the seventeenth from above. 



PLATE XVI. Casea broilii Williston. Fig. i, sacrum and first seven 

 caudal vertebrae, from the side, the sixth also from below, specimen No. 655; 

 Fig. 2, first ten caudal vertebrae, from the side, the third, fourth, and fifth 

 also from below, No. 656; Fig. 3, first chevron, from behind, No. 656. 



PLATE XVII. Casea broilii Williston. No. 655. Fig. i, fourteenth 

 postcranial vertebra, with ribs, from behind; Fig. 2, twenty-first postcranial 

 vertebra, with ribs, from behind; Fig. 3, twenty-second vertebra, with ribs, 

 from in front. 



PLATE XVIII. Casea broilii Williston. Fig. i, 10, rib of tenth postcranial 

 vertebra; 12, rib of twelfth vertebra; 15, rib of fifteenth vertebra; 18, rib of 

 eighteenth vertebra; Fig. 2, second caudal vertebra, from below; Fig. 3, third 

 sacral vertebra, from behind; Fig. 4, first sacral vertebra, from in front; Fig. 2, 

 specimen No. 656; all others, No. 657. 



PLATE XIX. Casea broilii Williston. Fig. i, right scapula from outer 

 side; Fig. 2, left scapula, from below; Fig. 3, right scapula, from behind; 

 Fig. 4, two distal phalanges of thumb, as articulated; Fig. 6, fifth metacarpal; 



