EXPLANATION OF PLATES 141 



Plate IX. — Varanosaurus brevirostris Williston. Right innominate. Fig. 

 1, from without; Fig. 2, from within. IL, ilium; IS, ischium; PB, pubis. 



Plate X. — Varanosaurus brevirostris Williston. Pelvis, from below, the 

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



Plate XL — Varanosaurus brevirostris Williston. Pelvis and first five 

 caudal vertebrae, from above. 



Plate XII. — Varanosaurus brevirostris Williston. Fig. 1, 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. 11, the same, distal 

 end. 



Plate XIII. — Varanosaurus brevirostris Williston. Seymouria baylorensis 

 Broili. Fig. 1, 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. 1, 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. 1, 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. 1, 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. 1, 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. 1, 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; 



