DESCRIPTION OF THE SIVATIIERIUM, 



of the rim is very oblique : tlie interval between the upper or frontal mar- 

 gins of the two orbits being 12.2 inches, and that of the lower or molar 

 margin 16.2 inches. 



*J)mENSIONS OF THE SKULL OF THE SIVATHERIUM GIGANTEUM. 



Eng. Inches. Metres. 



From tlie anterior margin of the foramen magnum to tlie alveolus of 1st molar, 18.85 .478 



From do. to tlie truncated extremity of the muzzle, . . , 20. G .5268 



From do. to the posterior margin of the last molar, 10.3 .262 



From the tip of the nasals to the upper fractured margin of the cranium, 18.0 .4508 



From do. do. to do. along the curve, 19.0 .4822 



From do. do. along the curve, to where the nasal arch begins to rise from the 



brow, ' 7-8 .198 



From the latter point to the fractured margin of the cranium, 11.2 .284 



From the tip of the nasals to a chord across the tips of the horns, . . . . , 8.5 .216 



From the anterior angle, right orbit, to the first molar, , 9.9 .251 



From the posterior do. do. to the fractured margin of the cranium, 12.1 .3075 



Width of cranium at the vertex (mutilation at left side restored), about 22.0 .559 



Do. between the orbits, upper borders, . , 12.2 .3095 



Do do. lower borders, 16.2 .4108 



Do. behind the orbits at the contraction of the frontal, . . 14.6 .3705 



Do. between the middle of the zygomatic arches, 16.4 .4168 



Do. between the bodies of the malar bones, ^ 16.62 .422 



Do. base of the skull behind the mastoid processes (mutilated on both sides,) 19.5 .496 



Do. between the cheek tuberosities of the maxillaries, 12.2 .3095 



Do. of muzzle portion of the maxillaries in front of the first molar, 6.8 .149 



Do. of do. where truncated (partly restored,) 4.1 .104 



Do. between the outer surfaces of the horns at their base, 12.5 .312 



Do. . . do do. fractured tips of ditto, 13.65 .347 



Perpendicular from a chord across tips of do. to the brow, 4.2 .165 



Depth from the convexity of the occipital condyles to middle of frontal behind 



the horns, 11.9 .302 



Do. from the body of the sphoenoidal to do. between the horns, 9.94 .252 



Do. from middle of the palate between the 3d and 4th molars do, at root of the 



nasals, , 7.52 .192 



Do. from posterior surface last molar to extremity of the nasals, 13,0 .331 



Do. from grinding surface penultimate molar to root of the nasals, . . . . « 10.3 ,262 



Do. from the convexity near the tip of the nasals to the palatial surface in front 



of the first molar, 5.53 .14 



* To facilitate comparison with the large animals described in Cuvier's Ossemens 

 Fossiles, the dimensions are also given iu French measure. 



