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University of California Publications. [Geology 



individuals of very large size, probably representing Pliauchenia. 

 At Virgin Valley there was also a large form and a much smaller 

 species. With the scattered limb elements available it is not 

 possible to make a definite determination of any of the forms 

 represented. 



Judging from the quantity of camel remains seen, these ani- 

 mals must have been very common in the fauna of this region 

 during the deposition of the Thousand Creek Beds, and also 

 formed an important part of the Virgin Valley fauna. 



An isolated third lower molar, no. 12765 (figs. 50a and 505), 

 from Thousand Creek represents a form that resembles Auchenia 

 in the presence of a prominent buttress or pillar on the antero- 

 external angle of the tooth. This buttress is also well-marked 

 in Camehts americanus described by Wortman 22 from the Pleis- 

 tocene of Hay Springs. The anteroexternal buttress is possibly 

 a little stronger than in C. americanus, but is not as well devel- 

 oped as in Auchenia lama. The dimensions of the tooth from 

 Thousand Creek are greater than in the type of G. americanus. 



Measurements 



No. 12765 



M 3 anteroposterior diameter 35.9 mm. 



M 3 , transverse diameter across protoconid 12.5 



C. americanus, Hay Springs 

 M 3 , anteroposterior diameter estimated from figure published by 



Wortman 29 mm. 



A portion of a skull comprising the premaxillaries and a 

 part of the maxillaries from Thousand Creek (fig. 51) repre- 

 sents a camel about as large as the existing Camelus bactrianus. 

 The posterior ends of the premaxillaries are truncated on both 

 sides in such a way as to suggest that they were covered by the 

 anterior ends of the nasals. I 1 and I 2 are absent, P 1 was large. 

 At a distance behind P 1 , which exceeds slightly the distance 

 between the canine and P\ there is a small alveolus for a pre- 

 molar which is presumably P 2 . 



CERVIDAE 

 BLASTOMERYX MOLLIS, n. sp. 



Type specimen no. 11564, Univ. Calif. Col. Vert. Palae. from 



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



