SUPPLEMENT. 333 



latter in the same family. The connection shown between the 

 Dichodontidce (Gelocus) and the Cervidce (Palceomeryx) by means of 

 the three above-mentioned genera is so close as to leave little doubt 

 as to the descent of the one family, through the Tragulidce, from the 

 other ; the existing genera of Tragulidce being lateral offshoots 

 from the same early stock. 



Leptomeryx evansi, Leidy *. 

 Syn. Trimerodus cedrensis, Cope 2 . 



This is the type and only species, and is about the size of Tragulus 

 meminna. 



Hab. North America. 



M. 2562. A fragment of the left maxilla, showing the last two 

 premolars and the first two true molars ; from the Miocene 

 of the White Eiver, Colorado, U.S.A. Less imperfect spe- 

 cimens are figured by Leidy in the ' Ancient Fauna of 

 Nebraska,' pi. xiv. 



Presented by R. LydeJcker, Esq., 1885. 



M. 2562 a. Four fragments of mandibular rami with teeth ; from 

 the same deposits. Same history. 



Genus DORCATHERIUM (pt. ii. p. 153). 

 Dorcatheriiim naui (pt. ii. p. 153). 



M. 3714. Cast of the right ramus of the mandible. Original (type) 

 from Eppelsheim : figured by Kaup in ' Oss. Foss. d. 

 Darmstadt,' pt. 5, pi. xxiii. fig. 1. 



Egerton Collection. Purchased, 1882. 



Family DICHODONTLILE (pt. ii. p. 159). 



Genus DICHODON (pt. ii. p. 164). 



Dichodon cuspidatus (pt. ii. p. 164). 



M, 3679. Part of the right ramus of the mandible with the three 



1 Proc. Ac. Nat. Sci. Philad. vol. vi. p. 394 (1853, TO!, dated 1854). 



2 Palseontological Bulletin, No. 16, p. 8 ; see Cope, Kep. U.S. Geol. Surv. 

 Terr. p. 503 (1874), 8vo. 



