8 A Kl', f..— S. YOSmW'AK'A AM> .1. [UASAKf. 



cenfrally ])l;ic('(l (Icutinc. Onlv in the ]t()st(']"i(»r outer one of these 

 jKirts is tliere fniiml hv the side of ;i larger ordiiuirv ]»ilhir another 

 smaller one. wliidi corresponfls to tlie talon of other bunodont 

 niamnials. At tlie hase of the middle of tlie anterior side, there is a 

 little protidjei-aiice wliieh however has l)een almost entirely woi-n 

 away by rul)l)inu- with the iirst ])remolar. 



Tlie second premolar of the u|)])er jaw (PI. II. I'm, I'l. Ill tiü'. 

 4) is only seen on its right side. Tlie crown is composed of four 

 cylindi-ieal pillars ami a very small protuberance at the anterior outer 

 edge. Thus tlie teeth of the upper jaw, when compared with those 

 of the lower, siiow much iewer tubercles. This fact is prol)ablv not 

 due to the loss of tubercles l)y mechanical action after the death of the 

 animal, but seems to have beeii a natural state, for, on examining the 

 corresponding Pj\L, in tlie lower jaw. we und that the surface in 

 contact with the former is deeply worn in, so that the surrounding 

 portion jjrojects a little oser the other parts. This projecting portion 

 is also worn ])y friction, Avhich indicates the existence oï Pj\I, in the 

 upper jaw, 



Molcirs : Molars are very large and distinctU' :^-rooted. The 

 molar of the lower jaw (I'l, III, fig, 5 a & b) has a length of (1,4''"^ 

 and a breadth of 4™'; and the height of the worn crown measures 

 8.9'"'. It closely resembles in form the lower I'M., but is much more 

 simple, being composed only <jf six regular pillars. 



The molars of the upper jaw (PI, II. M„ PI. III. tig, 4, Üg. 

 G a & b) are rather complex in foi-m. The outline of the masticat- 

 ing surface takes the form of an isosceles triangle with the apex- 

 directed posteriorly. The pillars are arranged in two longitudinal 

 and f(^ui- transverse rows. The transNcrsc row making the l):ise of the 

 triuno-le is formed of three i)illars with a smaller one intercidated 

 betw^een the two innermost pillars of this ;ind the next posterior row. 



