318 University of California Publications in Geology [Vol. 7 



the upper series being P 1 M-. P 3 is not represented, and P 4 is 

 reduced to a simple conical form not unlike the small P 3 of the 

 Raneho La Brea specimens. 



The American Pleistocene forms with which the Raneho La 

 Brea specimens are most closely related are those included in 

 the species that have been referred to Camelops, Auchenia, and 

 Holomeniscus. 



Comparison with Type Specimens of Camelops. — Leidy's type 

 of Camcolps consisted of the anterior end of a premaxillary bone 

 with the root of the last upper incisor, and a small piece of the 

 maxillary, with the alveolus of the canine (figs. 10a and 10b). 

 Compared with this specimen, the anterior end of the rostral 

 region of the Raneho La Brea skulls shows little to distinguish 

 it. The general proportions of the elements present and the 

 location of the teeth are nearly the same. The extension of 

 the maxillary forward around the anterior end of the anterior 

 palatine foramen noted in the Raneho La Brea specimens is much 

 as in the type of Camelops. 



Comparison with the Type Specimen of Auchenia hesterna 

 Leidy. — The type specimen of Auchenia hesterna was discovered 

 by Dr. Lorenzo G. Yates in Livermore Valley. California, in a 

 gravel deposit which was presumed by Dr. Yates to represent an 

 old river channel. A statement by Leidy. based upon the com- 

 munication of Professor E. 0. Hovey. to the effect that it was 

 found twenty-five miles inland from San Leandro. California, 8 

 is erroneous, according to Dr. Yates. 



The type consists of a lower molar series and a single upper 

 molar. There is some uncertainty as to whether these teeth all 

 represent the same individual. The fact that the relative stages 

 of wear are approximately what one might expect to find in the 

 same series is evidence in favor of the view that the lower teeth 

 are all from one animal. 



The dentition of the Raneho La Brea specimens resembles 

 that of the type of Auchenia hesterna in the presence of a single 



- Wortman, J. L., Bull. Am. Mus. Nat. Hist., vol. 10, p. 133, 1898. 

 s Leidy, J.. Geol. Surv. Terr., vol. 1, Fossil Vertebrates, pp. 228, 229, 256, 

 1873. 



s Yates, L. G., Proe. Acad. Nat. Sci., Philad., vol. 20, p. 18, 1874. 



