322 University of California Publications in Geology [Vol. 7 



The Pleistocene species described by Cope as Auchenia 

 vitikeriana 13 and Holonieniscus macrocephalus li are possibly 

 generically identical with the Rancho La Brea species, but are 

 specifically distinct. The form of the posterior lobe of M 3 

 in H. macrocephalus is quite different from that of Camelops 

 kesternus. 



SUMMARY 



The Rancho La Brea form seen in specimens nos. 20040 and 

 20028 closely resembles as much as is known of the type specimen 

 of Camelops Leidy. Although no satisfactory generic descrip- 

 tion of Camelops was given by Leidy, it is probable that the 

 Rancho La Brea specimens represent the same generic group as 

 the type specimen. Rancho La Brea specimen no. 20040 is evi- 

 dently generically and specifically identical with Leidy 's type 

 of Auchenia hestenta. It is also generically identical with 

 Cope's specimen identified as Holonieniscus hesternus, from 

 Texas. Cope's type of Holomeniscus sulcatus is evidently in the 

 same generic group. Holonieniscus vitikerianus presumably 

 belongs in the same genus with the species just mentioned, and 

 possibly also H. macrocephalus. 



As shown by Wortman the separation of the North American 

 Pleistocene camels from Auchenia is justified on the basis of 

 differences in the form of the inferior molars, and the characters 

 given by Cope to Holonieniscus are not distinctive. For the 

 present at least the writer adopts the suggestion of Wortman that 

 the name Camelops should be used for the group of species 

 represented by C. kamanus and C. liesternus, since it is the 

 earliest designation applied. 



The group of camels referred to Camelops, and represented 

 by specimens nos. 20040 and 20028 from Rancho La Brea, is 

 much nearer to Auchenia than to Camelus, but is nevertheless 

 distinct from the typical Auchenia. It is separated from 

 Camelus by the premolar formula of f. instead of § , relatively 

 small size of P 3 , broad contact of the nasals and premaxillaries, 



is Cope, E. D., Bull. I 1 . 8. Geol. and Geog. Surv. Terr., vol. 4, p. 380, 

 1878. 



i-i Cope, E. T>., Geol. Surv. Texas, 3rd Ann. Rep. for 1891, p. 85 and pi. 

 23, figs! 5 and 5a. 



