1870.) DR. J. MURIE ON SAIGA TARTARICA, 461 
edge of the inferior point of the lower lateral cartilage rests in the 
groove in front of the foramen. 
The malar or jugal bone (Jw) occupies between a fourth and a 
third of the orbital ring ; forms a broad buttress, which rests on the 
antrum of the maxillary, and sends back a short narrow spur to join 
the zygomatic process of the temporal. 

Skull of male Saiga in profile, with nasal cartilages zn sztw. 
Na. Nasal. Fr. Frontal. Z. Lachrymal. Mz. Maxilla. Pmzx. Premaxilla. 
Pa, Parietal. So. Supraoccipital. Ho. Exoccipital. Sg. Squamosal. Pmd. 
Paramastoid. Zy. Tympanic. Aw. Auditory bulla. $7. Styloid. P¢. 
Pterygo-palatine. Ju. Jugal. U7, Upper lateral cartilage. L/. Lower 
lateral cartilage. f Fibrous cord of nares. Ss. Sesamoid. Sp. Septal 
cartilage, its fibrous portion being partially removed. 
The premaxillaries (Pmz.), like the nasals, are conspicuous by their 
small size or abortive development. Lach is no more than 1? inch 
im extreme length, and, unlike that of any other Ruminant, merely 
tips the maxillary, without the palatal portion reaching the vomer. 
Both limbs of each >-shaped premaxillary are much flattened from 
above downwards, the upper stouter one possessing only a very 
limited tendency to override the projecting process of the maxilla. 
The somewhat scalene-figured cheek-surface of the maxillary bone 
(Mz) has a pronounced masseteric ridge, which runs well up to- 
wards the orbit. In front of its anterior and lower end, perpendi- 
cular to the last premolar, are four large sieve-like foramina; and 
through these the thick infraorbital nerves reach the facial region. 
I have already spoken of the long nasal or ascending process of the 
maxillary which dovetails between the divergent lachrymal pieces ; 
but the opposite or rostral portion of the maxilla is equally interest- 
ing. This latter anterior segment, which forms the anterior palatine 
_roofor prenirial floor, and in a less degree contributes to the outer 
Proc. Zoou. Soc.—1870, No. XXXI. 
