1910] 



Merriam: Fauna of Cedar Mountain Region 



18!) 



29b 



The horses of the Cedar Mountain region possibly represent two 

 horizons; one near that of the Barstow beds; the other possibly later 

 and nearer the Rieardo stage, or possibly intermediate between Barstow 

 and Rieardo. 



Proboscidea 

 TETRABELODON, sp. 

 Remains representing a large mastodon-like form are known from 

 locality 1988. Several fragments of the lower jaw show a dentition 

 including at least three cheek-teeth 

 simultaneously in place in the man- 

 dible. Two large lower tusks are in 

 place in the anteroposterior ly elon- 

 gated symphysial portion of the jaw 

 (figs. 29a and 296). A partial enamel 

 covering is shown on the lower tusks. 

 No specimens have been found in 

 which the occlusal portion of the 

 cheek-teeth is satisfactorily shown. 



Camelidae 

 PROCAMELUS, near GRACILIS Leidy 

 A specimen, no. 19820 (figs. 30a to 

 33) representing a small camel found 

 by Baker and Buwalda, at locality 

 2028 in Stewart Valley, consists of a 

 mandible with dentition, the anterior 

 end of the cranium, a nearly complete 

 anterior limb, six vertebrae and sev- 

 eral other scattered fragments of the 

 skeleton. 



This species is near Procamelus 

 gracilis and P. occidentalism but is 

 nearer the former in absolute size and 

 in proportions of premolars. The dimensions of the Nevada form are 

 close to those of Leidy 's type and are near those of the specimen from 

 New Mexico originally described by Cope as P. occidentalism but later 

 referred by him to P. gracilis. 9 Cope's specimen is slightly smaller 



Figs. 29a and 29?). Tetrabelo- 

 don, sp. Symphysial region of 

 mandible, inferior view and cross- 

 section, no. 22292, X Fig. 29a, 

 inferior view; fig. 29fr, cross-sec- 

 tion of distal end showing inferior 

 incisors. 



8 Cope, E. D.,U. S. Geol. Surv. west of 100th meridian, vol. 4, p. 329, 1877. 

 » Cope, E. D., Geol. Surv. Texas, 3rd Ann. Bep. for 1891 ; footnote on p. 37. 



