4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



Cope apparently did no collecting in the Uinta Basin but may have 

 been the first following Hayden's exploration to investigate the upper 

 Eocene of the Washakie Basin, although Marsh was likewise prompt 

 in getting into this area, supporting collecting parties here for several 

 seasons. In 1872 Cope obtained the Washakie specimen that in 1873 

 he described as Achaenodon insolens. Achaenodon was thus the first 

 artiodactyl named from the upper Eocene and, for that matter, the 

 first mammal known from this horizon in North America. 



Early investigations by Princeton University were conducted in the 

 Washakie Basin in 1878 by Osborn and others under the leadership 

 of J. B. McMaster. Material from upper or B horizon included the 

 skull and mandible that Osborn in 1883 described as Achaenodon 

 robustus. In 1886, led by Francis Speir, Princeton extended its ex- 

 plorations to the Uinta Basin and the collection obtained at that time 

 formed the basis for the 1887 preliminary report by Scott and Osborn, 

 followed by their memoir of 1889. The original descriptions of 

 Protoreodon and Leptotragulus are a part of the preliminary report, 

 but these forms are more fully described and figured in the memoir. 

 Princeton continued its fieldwork in the Uinta Basin in 1895, at 

 which time Hatcher succeeded in obtaining much of the excellent ma- 

 terial Scott described in his preliminary (1898) and final (1899) 

 reports on the selenodont artiodactyls of the Uinta beds. In the pre- 

 liminary note Scott, evidently hurried, named Camelomeryx and 

 Merycodesmus, both later found to be synonyms of Leptoreodon, and 

 gave the preoccupied name Agriotheriiim to one of his species of 

 Protoreodon. Much of this was corrected in the comprehensive 1899 

 report, and his interpretations were further aided by Wortman's 

 camelid study (see below), although he disagreed with Wortman in 

 certain details. In the later study Scott also included descriptions as 

 new of the genus Protagriochoerus and the species Protoreodon 

 minor. 



Peterson's activity in the Uinta Basin dates from 1893 when he 

 initiated the American Museum's field investigation of this upper 

 Eocene occurrence; however, it was not until 1894 that significant 

 collections were made. Specimens obtained during the latter year 

 were described by Osborn in 1895 ^^^ among the forms recognized 

 was a species of Achaenodon which he named Protelotherium uin- 

 tensis, regarding it as an elothere. Peterson's collection also furnished 

 the specimens described in the Eocene part of Wortman's 1898 paper 

 on the extinct camelids. In this work Wortman named Bunomeryx 

 and Leptoreodon as well as the oromerycid Protylopus, and added in- 



