g DESCRIPTION OF THE SIVATHERIUM, 



series of molars at an angle of about 45°. This is one of the marked cha- 

 racters about the head : 



BHIENSIONS OF THE TEETH. 



Last molar right side, 



Penultimate do. , ...o 



Antepenultimate do. .... • . = • 



Last simple molai% 



Second do, do. « 



First do, do. 



Interval between tlie surfaces of last molar, . 



Do. do. do. third molar, 



Do. do. do. second do. 



Do. do. do. first do. 



Space occupied by the line of molars 9.8 inches. 



Sones of the Head and Face. — From the age of the animal to which 

 the head had belonged, the bones had become anchylosed at their commis- 

 sures, so that every trace of suture has disappeared, and their limits and 

 connections are not distinguishable. 



The frontal is broad and flat, and slightly concave at its upper half. 

 It expands laterally into two considerable swellings at the vertex, and 

 sweeps down to join the temporals in an ample curve; and with no angu- 

 larity. It becomes narrower forwards, to behind the orbits ; and then 

 expands again in sending olf an apophysis to join with the malar bone, 

 and complete the posterior circuit of the orbit. The width of the bone 

 where narrowest, behind the orbit, is very great, being 16.2 inches. Partly 

 between and partly to the rear of the orbits, there arise by a broad base 

 passing insensibly into the frontal two short thick conical processes. They 

 taper rapidly to a point, a little way below which they are mutilated in 



Length. 



JJreaath, 



Inches. 







2.35 



2.20 



Z.oo 



l.DO 



O OA 



1.55 



2.z4 



1.70 



1.95 



1.70 



1.90 



Older 



Inner 



■nrfaces. 



Surfaces. 



9.9 



5.5 



9.8 



5.5 



8.4 



4.5 



6.4 



3.2 



