TICHOLEPTUS 



.87 



collected in Montana. However, they range from lower Miocene to lower Pliocene, and in some 

 instances the material is too fragmentary to make synonymy anything more than a guess. 



It appears to be very evident that this genus was derived from Eforeodon or, at least, from 

 some branch of the stem stock of that genus. 



Etymology: Ticholeftus (wall + delicate, slight); Brachycrus (short + leg). 



Species: 



T. bannackensis Douglass 1907. 



T. brachymelis Douglass 1907. 



T. brevicefs Douglass 1907. 



T. hyfsodus Loomis 1924. 



T. obliquidens (Cope) 1886. 



T. ■petersoni Loomis 1923. 



T. rusticus (Leidy) 1870. 



T. smithi (Douglass) 1903. 



T. zygomaticus Cope 1878. Genotype. 



T. sp. Merriam 1911. 



Fie. 137. — Ticholeftus bannackensis Douglass. Fragmentary skull and mandible. 



(After Douglass, 1907.) 



HT. Cat. No. 995 CM. 1/2 nat. size. 



Ticholeptus bannackensis Douglass 1907 

 Fig. 137; PL XXVII, fig. 3 



Original Reference: Some new merycoidodonts. Ann. Carnegie Mus., IV, pp. 108-109, pi. 30. 



Type Locality: Grasshopper Creek, about 10 miles above Bannack, Montana. 



Geologic Horizon: Upper Miocene (Flint Creek). 



Types: Holotype, Cat. No. 995 CM., "consists of a portion of the anterior upper part of the skull, a 

 mandible, and the greater portion of a skeleton." Paratype, Cat. No. 1 185 CM., part of skeleton without com- 

 plete skull. Collected by Earl Douglass in 1903. "Named after the old mining towns of Bannack." 



Specific Characters: This is the largest species of Ticholeftus so far described. Unfortu- 

 nately we know almost nothing of the skull. The facial vacuity is small and has a horizontal 

 diameter about three times that of the vertical. It lies in advance of and above a deep lacrimal 



