SIVATHERIUM GIGANTEUM. 255 



union of the latter with, the nasals. The same cause has ren- 

 dered obscure the connections of the niaxillaries with the 

 nasals and the depth and size of the nasal echancrure or 

 sinus. 



The jugal bone is deep, massive, and rather prominent. 

 Its lower border falls off abruptly in a hollow descending 

 on the maxillaries ; the upper enters largely into the forma- 

 tion of the orbit. The posterior orbital process unites with 

 a corresponding apophysis of the frontal, to complete the 

 circuit of the orbit behind. The zygomatic apophysis is 

 stout and thick, and rather flat. No part of the arch, either 

 in the temporal or jugal portions, is prominent ; the interval 

 between the most salient points being greatly less than the 

 hind part of the cranium, and slightly less than the width 

 between the bodies of the jugals. 



The extent and form of the lachrymals cannot be made 

 out, as there is no trace of a suture remaming. Upon the 

 fossU, the surface of the lachrymal region passes smoothly 

 into that of the adjoining bones. There is no perforation 

 of the lower and anterior margin of the orbit by lachrymal 

 foramina, nor any hollow below it indicatmg an infra-orbital 

 or lachrymal sinus. It may be also added, what was omitted 

 before, that there is no trace of a superciliary foramen upon 

 the frontal. 



The orbits are placed far forwards, in conseqtience of the 

 great production of the cranium upwards and the shortness 

 of the bones of the face. Their position is also rather low, 

 their centre being about 3*6 inches below the plane of the 

 brow. From a little injury done in chiselling off the stone, 

 the form in circle of the different orbits does not exactly 

 correspond. In the one of the left side, which is the more 

 perfect, the long axis raakes 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 Euminantia. 

 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. 



