150 



University of California Publications. 



[Geology 



CAMEL REMAINS. 

 Text, Fig. 2. 



Although camels were abundant in California during the 

 Quaternary, they did not play an important part in the fauna 

 of the region about the Potter Creek Cave. Three molars of a 

 camel were found in this cave but their fragmentary condition 

 does not permit of a generic reference. One of them, a third 

 inferior molar, is represented, natural size, in text figure 2, 

 The heel has been gnawed off by rodents. Most of the cement 

 and part of the external enamel layer have been removed by the 

 same means. 



euceratpierium collinum Furlong and Sinclair. 

 PI. 20, Figs. 1, 2, 



Pub. Univ. OaL, Am. Arch, and Eth., Vol. 2, p. 18; Bull. Dept. Geol. 

 Univ. OaL, Vol. 3, p. 412. 



This ungulate is represented by abundant remains in the 

 Potter Creek Cave, where it occurs in all bone-bearing strata. 

 The specimens comprise numerous teeth from both jaws, loose 

 podial elements, and broken horn-cores, some of which are sup- 

 ported by a part of the frontal. The various parts of the 

 skeleton were not found associated, but there can be little doubt 

 that they all belong to this genus. The horn-cores and the teeth 

 of the superior series agree with the type specimen. As these 

 remains do not indicate the presence of more than one species, 

 the limb bones are also referred to E. collinum. 



The various podial elements of Euceratherium agree closely 

 in almost every particular with the corresponding bones in the 

 feet of Aplocerus, excepting in size. Both anterior and pos- 

 terior cannon-bones are short and robust. In the anterior can- 

 non-bone, the posterior margins of the proximal articular sur- 

 faces lie in the same plane, while anteriorly they meet in an 

 obtuse angle, producing an emargination of the anterior 

 proximal border which is less marked than in Aplocerus. (Com- 

 pare PI. 20, figs. 2 and 3.) The nutrient foramen piercing the 

 anterior surface of the bone above the distal condyles is also 

 much smaller than in Aplocerus. 



