80 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



distinctly smaller form. Teeth from Dp2 to M2 of both upper and 

 lower series are included and the lower molars are actually a little 

 smaller than in the type oi H. calciculus. Also in the U. of C. collec- 

 tion is an isolated upper molar of unusually large size. This, however, 

 is described in field notes as coming from float along the base of the 

 escarpment, so that its level is not known, except that it is likely from 

 beneath the Tipton tongue. It would seem here from a limited number 

 of specimens that more than one species is represented, but allocation 

 of material is not readily evident. 



A revision of the Eocene tapiroids undertaken by Leonard Radinsky 

 at Yale University should furnish information having a direct bearing 

 on this problem. 



HYRACHYIDAE 



HYRACHYUS, cf. MODESTUS (Leidy) 



(Plate 12, figures 3 and 4) 



Hyrachyus is now known to be represented in the Cathedral Bluffs 

 member in the three principal areas in which these beds are exposed. 

 In addition to the specimen which includes the M^ (U.S.N.M. 

 No. 22771; pi. 12, fig. 3) discussed in 1952, there is another asso- 

 ciated lot of tooth fragments from the New Fork beds which includes 

 a complete P* (U.S.N.M. No. 22772 ; pi. 12, fig. 4), and an isolated P4. 

 The partial dentitions from the Cathedral Bluffs of the Washakie 

 Basin were described and figured by Morris (1954). Not previously 

 recorded is a lower jaw with P2-M3 (U.S.N.M. No. 22yy^), rather 

 poorly preserved however, from the beds mapped as the Cathedral 

 Bluffs member to the southwest of Continental Peak, near the bound- 

 ary between Sweetwater and Fremont Counties. All these materials 

 can be closely matched with Bridger specimens that have been re- 

 ferred to one or another of the various species that Wood (1934) 

 has placed in synonymy with Hyrachyus modestus, a situation entirely 

 comparable to that noted by Wood for the Hyrachyus specimens from 

 the Lost Cabin beds of the Wind River Basin. So far no material 

 that can be referred to this genus has been found in the Knight beds 

 below the Tipton tongue. 



ARTIODACTYLA 



DICHOBUNIDAE 



DIACODEXIS, cf. METSIACUS (Cope) 



Five lower jaw fragments, one of these (U.S.N.M. No. 22240) 

 with P4, Ml, and Ms, and a second (U.S.N.M. No. 22241) with 



