Peterson: Material Discovered in Uinta Basin. 115 



short and thick, while in Ilcptodon and lielaleles they are long and 

 slender. In Lophiodon the femur has a curved shaft with the third 

 trochanter located well down, the distal end broad; low and broad 

 condyles and rotular trochlea; tuber of calcaneuni short and thick; 

 astragalus broad, low, with its trochlea directly fore-and-aft. In 

 Heptodon and Helaletes the hind limb is, as-we have seen, long, slender, 

 and in structure quite equine. Such a broad inclusion of characters 

 would necessitate, to my mind, the inclusion, of other early groups of 

 the Perissodactyls more or less interrelated {e.g., the Pala'otheres, 

 the early Equidse, and even certain phyla of the Rhinocerotoi'lea) 

 in this group an arrangement obviously out of reason, especially in 

 view of our present accepted order in the phylogeny. 



If the fragmentary material of the small lophiodont described and 

 figured by Cuvier,^^ again referred to and figured by Blainville,*^ and 

 also referred to under the name " Colodon'' miyiimus by Gaudry,** 

 belongs to the same species, it appears that it differs from both Hela- 

 letes and Colodon (C. longipes Osborn and Wortman).^*^ These 

 European remains appear to be on the whole more tapir-like, i.e., they 

 have a lower and broader tarsus, and the astragalar trochlea less 

 oblique than in the He ptodo7i- Colodon series of America. We may 

 well question the propriety of including them in the same family. 



ISECTOLOPHID.E jam. nov. 



Small Perissodactyls of the Eocene with dentition f , \, f, f . P- with 

 one or tivo well defined internal cones. P- with one internal cone. Para- 

 and metacones subequal and conic. With or without diastema. Cross- 

 crests of lower molars more or less perfectly developed. Connecting crests 

 hetiveen proto- and hypoconids. Large hypoconuUd on M^. 



This proposed family includes Homogalax {" Systemodon") Hay as 

 defined by Osborn, Wortman^^ and Granger ** and Parisectolophus 

 {" Isectolophus") latidens, vide infra. A third genus Schizolophodon, 



*^ Cuvier, Oss. Foss., Tom. II, 1825, p. 194, Figs. 20-25. 



S"" Blainville, Osteographie, Tom. IV, Y, page 100, PL III (fourth specimen). 



85 Gaudry, Bull. Soc. Geol. de France, Tom. XXV, 1897, pp. 318-319. PI- IX, 

 Fig. 4- 



8« Osborn, H. F., and Wortman, J. L., Bull. Amer. Mus. Nat. Hist., Vol. VI, 1894, 

 p. 214. 



8" Bull. Amer. Mus. Nat. Hist., Vol. IV, 1892, p. 124. 



88 0^. cit.. Vol. XV, 1908, p. 241. (See note in the present paper, page 103, in 

 regard to Mr. Granger's identification of Systemodon and Homogalax.) 



