ri.ATE 1. 
1. Arsinoitherinm zHteli, Bcadnell ; skull, left lateral view; the ends of the 
horns have been restored: one-third nat. size. Fluvio-marine beds 
(Upper Eocene). [M. 8463.] 
ao./., aiitorbital foramen. 
h.n., h.i’.' , impressions of blood-vessels. 
(•., alveolus of canine. 
t.a.m., external auditory meatus, 
t.ro., cxoceipital. 
f.h., frontal horn. 
f.l.a., foramen lacerum anterius. 
/>., frontal. 
i. 1-3, incisors or their alveoli. 
>., jugal. 
?., lachrymal. 
)/n 1-13, molars. 
icr.s., prenasal bar. 
max, maxilla, 
an., nasal. 
a nr., external nares. 
a.//., nasal liorii. 
ovi./., orbito-uasal foramen, 
jiarietal. 
ya//., postglenoid process. 
]>1., palatine. 
pm. 1-4, premolars or their alveoli. 
pni.v., premaxilla. 
paroccipital process. 
j)f., pterygoid. 
7 < 0 /., post-tympanic process. 
,s'y., squamosal. 
.s’/.r., sui>ratemporal ridge. 
II., optic foramen. 
