40 



articular face, concave from side to side ; while upon the 

 exposed sides are smooth facets, indicating the presence of 

 two additional toes of less size. (See Plate III.) The con- 

 vex distal faces are marked behind by a slight groove. 



The phalanges are very short and broad, the lower facets 

 marked by a shallow median groove. The ungual phalanx 

 is wide and short, with a crescentic outline. 



Mcasuroiicnts. 



M. 



Third metatarsal, total length -ogo 



Third metatarsal, transverse diameter, proximal face -017 



Third metatarsal, transverse diameter, distal end -019 



Second phalanx, length -024 



Third phalanx 014 



Total estimated length of manus (6 inches) • 155 



Pal/EOSyops vallidens. Cope. 



Proceedings Am. Phil. Society, 1872, p. 487 ; Hayden's Survey, 1872, p. 572. 



Specific characters. — Founded on details of dental structure. 

 Superior size. In the upper molars two strong transverse 

 ridges connect the inner tubercle with the outer crescents, 

 inclosing a pit between them. In the premolars the outer 

 crescents fuse almost into a single ridge. These united cres- 

 cents are relatively narrower. The inner molars are also 

 narrower, and the posterior tubercle of the last is an elevated 

 cone. 



Fragment of a lower jaw containing the two posterior 

 molars. The measurements of the teeth are identical with 

 those given by Professor Cope. The depth of the ramus 

 below the last molar is three and one third inches, and it is 

 slightly heavier below than in P. major. 



Restoration of Palceosyops. — The elevation of Palcsosyops 

 major, which is taken as a type, was approximately the same 

 as that of PalccotJieriiim magnum as restored by Cuvier. 



The nearly complete ilium, femur, tibia, and tarsus of P. 

 major in our possession, enable us to make the following esti- 

 mate of the elevation of the hind quarters. 



