192 University of California Publications in Geology. [Vou 6 



found fossil in the "lead region of Illinois, Wisconsin, and 

 Iowa," and in the Hay Springs deposits on the Niobrara River, 

 Nebraska, all of which are of Pleistocene age. 



In 1902 1 Matthew described an animal from the Hay 

 Springs fossil beds mentioned above, which appeared to be 

 related to Merycodus and to Antilocapra. This form he named 

 Capromcry x furcifer, referring it to the Merycodontidae. 



Neotragocerus improvisus, 2 described by Matthew and Cook 

 from the Snake River formation of western Nebraska, repre- 

 sents the existing Eurasian and African tragocerine division of 

 the antelopes. 



American representatives of the strepsicerine or twisted- 

 horned group of antelopes were recently discovered by J. C. 

 Merriam 3 in the Thousand Creek beds of northern Nevada and 

 described as Ilingoceros alexandrae. Sphenophalos nevadanus, 

 found with Ilingoceros, while "not far removed from the tragela- 

 phine forms of the Thousand Creek fauna," is not clearly 

 referable to any of the existing subdivisions of antelopes. 



The fossil material representative of antelopes in North 

 America being so exceedingly scanty, additional interest attaches 

 to each new fragment. 



DESCRIPTION 



CAPROMERYX (?) MINOR, now species 



Jaws and Dentition. — Jaw very much smaller than that of 

 Antilocapra aniericana of slightly greater age. The specimen of 

 prong-horn at hand (no. 8299, Calif. Mus. Vert. Zool.) still 

 retains the milk dentition, but its molars are further advanced 

 than in Capromeryx. The length of one of the portions of the 

 jaw of Capromeryx (?) minor (no. 12523) is 55 mm.; while a 

 roughly corresponding one of Antilocapra americana is 170 mm. 

 The dimensions indicate that the present species is about the 

 same size relative to the size of the prong-horn as is Capro- 



1 Bull. Am. Mus. Nat. Hist., vol. 16, 1902, p. 317. 



2 Bull. Am. Mus. Nat. Hist., vol. 26, 1909, pp. 361-414. 



3 Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, p. 320, 1909. 



