48 



referred to Pulccosyops major, and tlic jaw-specimen, witli teeth, of P. palu- 

 dosus, are as follows : 



Depth of jaw at middle of last molar 



De'lith of jaw at middle of last premolar 



Thickness of jaw below interval of last two molars 



Thickness of jaw below third premolar 



Distance from canine alveolus to back of last molar 



Length of the complete molar series 



Length of the molar series, excluding the first premolar 



Length of the molar series, exclnding the first two premolars 



Length of the premolar series 



Length of the true molar series 



Breadth of second premolar 



Thickness of second premolar 



Breadth of third premolar 



Thickness of third premolar ... 



Breadth of fourth premolar 



Thickness of fourth premolar 



Breadth of first molar ". 



Thickness of first molar 



Bieadth of second molar 



Thickness of second molar 



Breadth of third molar . - 



Tbickness of third molar 



PaliBosyops 

 major. 



Lines. 

 37 

 26 

 IG 

 14 

 92 

 90 

 82 

 72 

 38 

 53 



9 



5 



8^ 



7 

 13i 



9 

 ICi 



m 



24 

 13i 



Lines. 



08 

 51 



8 

 G 

 8a 



13i 



ICJ 



wl 



22 

 12 



Paliposyops 

 paludosus. 



Lines. 

 32 

 23 

 13 

 lOi 

 ?77 



64 

 4GJ 



8.i 



5i 

 9 



6:} 



12i 



s" 



15 



9i 

 19 

 10 



Some additional specimens, found by Dr. Corson iu the buttes of Dry 

 Creek Caflon, appear to belong to tlie larger Palaeosyops. These consist of 

 some upper tectli, comprising a canine, a second and last premolar, and the 

 second and third molars. 



The latter are represented in Figs 10, 11, Plate XXIII, and they agree 

 in character witli the corresponding smaller teetli described nnder the head " 

 of Pu/cBO-si/ojys paludosus. They are but slightly worn at the summits of the 

 lobes of the crown, and the enamel is conspicnonsly wrinkled. 



The last premolar, represented in Fig. 9, of the same plate, likewise agrees 

 with the corresponding tooth described umler the head of PalcBOstjops palu- 

 dosus, except that it is of larger size. The tooth is Init slightly worn, and 

 e.xhil^its a much less wrinkled condition of the enamel than the true molars. 



The second premolar, represented in Fig. 8, resembles in form that of the 

 second series of specimens of upper molar teeth, described under the head of 



