ART. 23. 



AN EXTINCT VARANID LIZARD GILMORE. 



21 



Hu77ierus. — The right humerus is present and in a fair state of 

 preservation. Some portions of the anterior side of the distal half of 



the shaft and the condylar articular surface 

 for the radius on the distal end are missing. 

 Compared with the corresponding element 

 in a skeleton of Varanus salvator. No. 29551, 

 U.S.N.M., it agrees very closely in general 

 form except for the more abrupt expansion 

 of the ulnar side of the distal end and the 

 apparent reduction in extent of the thin 

 sharp ridge on the radial or outer border. 

 This ridge is perforated by the ectepicon- 

 dylar foramen. The ridge appears to have 

 been restricted in height and also in the 

 distance it extended upward on the shaft 

 of the bone, as contrasted with the Varanus humerus (see fig. 21). 

 In the abrupt outward expansion of the ulnar border of the distal 

 end, this bone more nearly resembles the humerus of Iguana tuher- 



D 



Fig. 20. — Left coracoid of 

 Varands SALVATon. Cat. 

 No. 29551, U.S.N.M. Ven- 

 tral VIEW. Natural size. 

 Compare with Fig 19 

 gc, GLENOID cavity ; sc, 



SCAPULA articulation. 



\ 



ro-.c 



Fig. 21. — Left humerus of Saniwa ensidens Leidt. Tvpe, Cat. No. 2185, U.S.N.M. 

 A, superior view ; B, oblique inferior view ; C, ventral view ; D, left humerus of 

 Varanus salvator. Cat, No. 29551, U.S.N.M. Ventral view, d, deltoid crest; 

 ep, epiphysis; /, foramen; oc, outer condyle; ra.c, radial condyle; ul.c, ulnar 

 CONDYLE. All natural size. 



culata. In Varanus the same expansion is achieved, but by a gradual 

 curve outward, beginning higher up on the shaft of the bone. 

 Varanus sivalensis, as figured^ by Falconer, is intermediate in re- 

 spect to the contour of this end of the humerus. 



» Paleontologlcal Memoirs, vol. 1, 1888, pi. 32. 



