ART. 23. 



AX EXTINCT VARANID LIZARD GILMORE. 



27 



The extinct members of the genus Varanus have been thoroughly 

 reviewed and discussed in Fejerviiry's excellent paper, Contributions 

 to a Monography on Fossil Varanidae and on Megalanidae, and, as 

 he has so clearly pointed out, are very unsatisfactorily known. Of 

 the 10 extinct species described, he regards only four of "established 

 specilic value." At this time very little satisfaction was obtained 

 in attempting to contrast the extinct American forms with the Euro-, 

 pean species, except that Saniwa from the Bridger (Middle Eocene) 

 has the distinction of being the most ancient Varanid lizard yet dis- 

 covered in North America, if not in the world. 



List of North American fossil Varanidae. 



Names. 



Saniwa ensidens Leidy . 

 Saniwa major Leidy . . . 



Sanitva paucidens (Marsh). 

 Saniwa leptodus (Marsh)... 

 Saniiva crass us (Marsh) . . . 

 Saniwa grandis (Marsh) . . . 

 Saniwa agilis (^larsh) .... 



Locality. 



Near Granger, Wjoming. . . 

 Lodge Pole Trail crossing, 



Dry Creek, Wyoming. 

 Grizzly Buttes, Wyoming.. 



do 



Henry's Fork, Wyoming. . . 

 Grizzly Buttes, Wyoming. . 

 Henry's Fork, Wyoming. .. 



Formation. 



Bridger, Middle Eocene. 

 Do. 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 



