44 Description of the Sivatherium, [Jan. 



axis makes a small angle with that of the plane of the brow : the antero- 

 posterior diameter is 3.3 inches, and the vertical 2.7 inches. There is no 

 prominence or inequality in the rim of the orbits, as in the Ruminantia. 

 The plane of the rim is very oblique : the interval between the upper or 

 frontal margins of the two orbits being 12.2 inches, and that of the lower 

 or molar margin 16.2 inches. 



* Dimensions of the Skull of the Sivatherium Giganteum. 



Eng. Inches. Metres. 

 From the anterior margin of the foramen magnum to the alveolus of 



1st molar, 18.35 .478 



From do. to the truncated extremity of the muzzle, 20.6 .5208 



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 cra- 

 nium, 18.0 .4568 



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, .... 1 1,2 .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 .4103 



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, 5.8 .149 



Do. of do. where truncated (partly restored), 41 .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 fron- 

 tal behind the horns, 11.9 .302 



Do. from the body of the sphoenoidal to do. between the horns,.. .. 9.94 .232 

 Do. from middle of the palate between the 3rd and 4th molars do. at 



root of the nasals, 7.52 .192 



Do. from posterior surface last molar to extremity of the nasals, . . 13. .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 sur- 

 face in front of the first molar, 5.53 .14 



Depth from middle of the alae of the occipital to the swell at vertex 



of frontal, 8.98 .228 



Do. from inferior margin of the orbit to grinding surface 5th molar, 7.3 .186 

 Do. from the grinding surface 1st molar to edge of the palate in 



front of it, 2.6 .066 



Space from the anterior angle of orbit to tip of the nasals, 10.2 .2595 



Antero-posterior diameter left orbit, 3.3 .084 



Vertical do. do 2.7 .0685 



Antero-posterior diameter of the foramen magnum, 2.3 .058 



Transverse do. do 2.6 .066 



Long diameter of each condyle, 4.4 .112 



Short or transverse do. of do 2.4 .0603 



Interval between the external angles of do. measured across the 



foramen, 7.4 .1SS 



Among a quantity of bones collected in the neighbourhood of the spot 

 in which the skull was found, there is a fragment of the lower jaw of a 



very large ruminant, which we have no doubt belonged to the Sivatherium: 



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

 xnen Fossiles, the dimensions are also given in French measure. 



