ARSTNOITHEEIUM. 
3 
front of tin's 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 
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Skull of Arsinoitlierium zitteli, seen from behind. 
hoc., basioccipital ; cond., condyles ; exo., exoccipital ; f.h., frontal born ; f.m., foramen magnum ; in.n., 
internal uares ; n.h., nasal horn ; jjr., prominence of sqtiamosal ; pterygoids ; s.c., lambdoidal crest ; 
HOC., snpraoccipital. | nat. size. 
the widest part of the posterior portion of the skull is situated just above and behind 
the auditory opening. In a palatal view (PI. II. fig. 1) the peculiar wedge-shaped 
