172 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



On the other hand, Leidy's Plate 4, Figures 5 and 6, 

 represent an upper dentition of uncertain specific ref- 

 erence. The "beautifully preserved mandible" 

 (Leidy's pi. 5, figs. 10, 11) is probably referable to P. 

 paludosus. Hence we may regard P. minor as a syno- 

 nym of P. paludosus. 



Type locality and geologic horizon. — Cottonwood 

 Creek, Bridger Basin, Wyo.; Palaeosyops paludosus- 

 Orohippus zone (Bridger B). 



Holotype. — "A jaw, No. 10275 [Princeton Mus.], 

 associated with a well-preserved radius, ulna, and two 

 metacarpals." 



Ci 



FiGUKJs 107. — Earle's ootypes of Palaeosyops minor in the collection of the Academy of Natural 



Sciences of Philadelphia 



Ai, Lett maxilla with root of canine and premolar-molar series. After Leidy, 1873. Two-thirds natural size. Aj, The same; 

 outer view of premolar-molar series. B, Another specimen; left upper premolar-molar series. After Leidy, 1873. Two- 

 thirds natural size. (A reversed view of this specimen, which is of uncertain specific reference, was figured by Earle 

 as the type (Earle's pi. 12, fig. 14).) Ci, Left mandibular ramus with p3-m3. After Leidy, 1873 (pi. 5, fig. II). One-halt 

 natural size. C2, The same, pj-ma; crown view. After Leidy, 1873 (pi. 5, fig. 10). One-half natural size. The last two 

 specimens are referable to Palaeosyops paludosus. 



Palaeosyops longirostris Earle, 1892 



Cf. Palaeosyops longirostris Earle, this monograph, page 319 



Original reference. — Acad. Nat. Sci. Philadelphia 

 Jour., 2d ser., vol. 9, p. 338, 1892 (Earle, 1892.1). 



Characters. — Earle writes: 



The type jaw of this species, with the parts of the skeleton 

 associated with it, was referred by Scott and Osborn [Osborn, 

 1878.3, pp. 37, 38] to our P. minor (equal, in part, to P. palu- 

 dosus Leidy). After comparing Leidy's type specimen [prob- 



