AE8IN0ITHEEIUM. 



front of this the nearly flat parietal region, passing anteriorly into the rounded common 

 base of the great horns. The zygomatic arch does not project very strongly, and 



Text-fig. 1 



Skull of Arsinoitheriitm zitteli, seen from behind. 



hoc, basioceipital ; cond., condyles ; ea;o., exoccipital ; f.li., frontal horn ; f.m., foramen magnum ; in.n., 

 internal nares ; n.h., nasal horn ; ^r., prominence of squamosal ; ^i., pterygoids ; s.c, lambdoidal crest ; 

 i-yc, supraoccipital. | nat. size. 



the widest part of the posterior portion of the skull is situated just above and behijid 

 the auditory opening. In a palatal view (PI. II. fig. 1) the peculiar wedge-shaped 



b2 



