VERTEBRATE FAUNA OP THE BLANCO BEDS, 57 



Depth calcaneum at middle of tuber 16 



{proximally 9 



at middle of shaft G 



distally above condyle . . 10 



Length penultimate phalange No. i 13 



Width of same at condyle 7 



Length penultimate phalange No. ii 24 



Width of same at condyle 10 



The shortness of the raetapodium and width of the calcaneum in this 

 species indicate that this species was less digitigrade than the existing 

 species of Felis. Its dimensions were probably about those of the 

 cheetah {Cynoblurus jubatus). 



The typical specimens were found by Mr. W. F. Cummins. I name 

 the species in honor of Prof. Robert T. Hill, who has done important 

 work in the geology of the Staked Plains. 



PROBOSCIDIA. 



TETEABELODON, Cope. 



Proceeds. Amer. Philos. Soc, 1884, p. 2; American Naturalist, 1889, 

 p. 193. 



TETRABELODON SHEPARDII, Leidy. 



Plate XXIV. 



Mastodon shepardii, Leidy, Proceeds. Acad. Philadelphia, 1870, p. 98; 

 1872, p. 472. Cope, American Naturalist, 1884, p. 524. 



Dibelodon shepardii, Cope, Proceeds. Amer. Philosoph. Soc, 1884, p. 

 5, partira. 



Mastodon obscurus, Leidy, partim, Eeport U. S. Geological Survey 

 Terrs. I, p. 330. PI. XXL, 1873. 



A lower jaw of this species, lacking the condyles, and supporting the 

 second and third true molars, was taken from the bluff at Mont Blanco 

 from the same excavation that yielded the Pliauchenia spatula, Cope, 

 and within fifty feet of that at which the tooth of T. prcecursor was ob- 

 tained. It came into possession of Mr. M. M. Cox of Estacado, from 

 whom I obtained it by purchase after my return from Texas. The ac- 

 quisition of this specimen is important as enabling me to determine the 

 true characters of this species, since it has been known so far only from 

 a last inferior molar, and possibly a fragment of a tusk, both from Cali- 

 fornia. 



The second true molars are much worn, but they show only three 

 cross-crests without a rudimental fourth, as was to have been expected 

 from the character of the third molar. The third true molar exhibits 

 exactly the simple characters of the typical specimen described by Leidy; 



