NO. 8 MAMMALIAN FAUNA, BADWATER AREA — GAZIN II 



correlation so that the tooth may well have originated in the Uinta 

 equivalent present in the sequence. 



PERISSODACTYLA 

 EQUIDAE 



EPIHIPPUS, cf. GRACILIS (Marsh), 1871 

 Plate I, figure s 



The rather scant material representing Epihippus was first en- 

 countered in the Badwater localities in 1953. A maxillary fragment, 

 U.S.N.M. No. 21092, including P-, P^, and part of P* and a single 

 lower molariform tooth, U.S.N.M. No. 21094, possibly Mo, represent 

 an equid approximately the size of Epihippus gracilis. 



P^ in No. 21092 is advanced over Orohippus in the development of 

 the lingual portion, but not nearly so molariform as in Mcsohippus. 

 The anterointernal cusp in this tooth appears weaker than in the type 

 of Epihippus parvus as figured by Granger (1908), being scarcely 

 more than a low crest, extending lingually from the lingual surface 

 of the paracone rather than from a position anterior to the paracone. 

 There is no evidence of a mesostyle on P^. P^ would appear to be en- 

 tirely molariform. The second premolar measures 6.7 mm. long by 

 5.8 transversely. 



The lower molar, in comparison with Uintan horses, shows little 

 of diagnostic importance other than size which is close to that of the 

 preserved molar (Mi) in the type of Epihippus uintcnsis (Marsh), 

 placed by both Marsh and Granger in synonymy with E. gracilis. The 

 tooth is a little smaller, though scarcely if any more brachydont than 

 Epihippus (Duchesnchippus) intermedins. The V-shaped crests of 

 the lower molar, however, are a little less acute than in the Duchesncan 

 horse. The metaconid and metastylid are separate at the apex but this 

 has been noted in molars as well as premolars of both the Uintan and 

 Duchesnean Epihippus. The tooth measures 9.0 mm. long by 6.3 wide. 



EPIHIPPUS, cf. PARVUS Granger, 1908 



Plate I, figure 6 



The material of a smaller horse in the Badwater fauna likewise in- 

 cludes a maxillary portion with P- and P'*, U.S.N.M. No. 21091, and 

 an isolated lower molariform tooth, U.S.N.M. No. 21093. There is, 

 in addition, the greater part of an isolated molariform upper cheek 

 tooth. 



