50 



last, inclusive, represented in Fig. 12, Plato XXIII. The crowns of the 

 teeth arc worn, and also somewhat eroded, but not to such an extent as to 

 obscure their characters. 



The last upper premolar agrees with that previously described and referred 

 to Palceosyopa major, except that it is of more uniform width. 



The third premolar is a reduced representative of that behind it, but is also 

 proportionately of less width transversely. 



The second premolar is like the corresponding tooth above described and 

 referred to Palceosyops major-, but is considerably narrower fore and aft. 



A much worn upper true molar, partially broken away externally, is rather 

 smaller than the specimen of a second upper molar above described and 

 referred to Palceosyops major. It sufficiently accords with it to be the first 

 of the series of true molars. 



Another specimen consists of a mutilated canine, intermediate in size to 

 the more perfect one above described, and the larger one, contained in the 

 facial specimen described under the head of Palceosyops paludosus. The fang 

 toward the extremity is more curved than in either of the other specimens. 



An upper lateral incisor was about the size of the one previously described, 

 but has a stouter fang. Its crown, broken toward the point, is deeply worn 

 away internally. 



Another incisor, a lower one, is represented in Fig. 15, Plate XXIII. It 

 has a short, conical crown, with a strong basal ridge posteriorly. 



The measurements of the specimens are as follows : 



Lines. 



Antero-posterior diameter of upper true molar, estimated 16 



Transverse diameter of upper true molar 18 



Antero-posterior diameter of upper last premolar 8f 



Transverse diameter of upper last premolar 12^ 



Antero-posterior diameter of upper third premolar 8 



Transverse diameter of upper third premolar. 10£ 



Antero-posterior diameter of upper second premolar 7 



Transverse diameter of upper second premolar . 8| 



Length of fang of canine 25 



Diameter of fang of canine - 12 



Length of fang of upper incisor 22 



Diameter of fang of upper incisor 7J 



Length of crown of lower incisor 



Antero-posterior diameter of lower incisor 



Transverse diameter of lower incisor - 5 



An important and instructive specimen pertaining to Palceosyops major is 

 represented in Fig. 16, Plate XXIII, and Fig. 1, Plate XXIV. It consists 



