50 



last, inclusive, ir[)i-cs('iitctl in Fii^. 12, Plate XXIII. The crowns of the 

 teeth are worn, and also somewhat eroJeil, Init not to such an extent as tu 

 obscure their characters. 



The last npper premolar agrees \\ ith that previously described and referred 

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



The third premolar is a reduced representative of that behind it, i)nt is also 

 pro])ortionately of less width transversely. 



The second premolar is like the corresjujuding tooth above described and 

 referred to Palaosyops major, but is considerably nari'ower 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 PalcBosyops 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 oi' Pa/ausj/ops j)aludosi/s. The fimg 

 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, 

 l)ut has a stouter fang. Its crown, Ijroken toward the point, is deeply \\orn 

 away internally. 



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

 has a short, conical crown, with a strong basal i-idge posteriorly. 



The measurements of the specimens are as follows: 



Liiu's. 



Antero-posterior diameter of upper true molar, estimated 10 



Transverse diameter of upper true molar 18 



Antero-ijosterior diameter of upper last premolar S'} 



Transverse diameter of upper last premolar 1-| 



Anteroposterior diameter of upper third pi-einolar 8 



Transverse diameter of upper tiiird premolar. 11':^ 



Autero-posterior diameter of upi)er second premolar 7 



Transver.se diameter of upper second premolar , 8^ 



Length of fang of canine -^ 



Diameter of fang of canine 12 



Length of fang of npper incisor 2-! 



Diameter of fang of u[)per incisor 7i 



Length of crown of knvvr incisor 



Antero-posterior diameter of lower incisor 



Transverse diameter of lower incisor ■ 5 



An important and instructive specimen pertaining to /'^/Zews/yo^w /«(//o/- is 

 reiiresenfed in Fig. Iti, Plate XXIII, and Fig. 1, Plate XXIV. It consists 



