TKirriAliY VEKTE15RATA OF THE FATt.Al. 
52 
portion of the inm'r facet the surface of the l)one slo))es strongly downwards 
towards tlie not v('ry ])ronunent but massive cnemial crest {cn.). Immediately 
beneath tlie ])ostero-external angle of the proximal end of the hone is a l)road 
lacet (/.) for union with the upper end of the fibula. Beneath the cnemial crest 
the shaft is trilu'dral ; its posterior face is nearly flat, the antero-external first 
concave, then towards the middle of the bone flat, the antero-internal rounded. 
'ITie distal end of the bone is expanded laterally, so that it is nearly twice as wide 
in that direction as from before backwards. The greater portion of the distal 
Text-fig. 30. 
Right tibia of Arninoitheriinn zitteVc. A, from front ; R, from baiF ; C, jiroximal end ; 1), di.stal end. 
(xxt., surface for astragabus ; oi., cnemial crest ; surface for proximal (uid of fibula ; f.\ suiTace for distal 
end of filjula ; inner surface for femur; i.m., internal malleolus; o., outer surface for femur, 
f nat. size. 
end is occupied by the slightly concave surface for the astragalus (a, ‘if.). 'Fliis is 
produced somewhat downwards into a ])oint jiosteriorly and much more strongly 
internally, where it runs down on to the face of the blunt interuiil malleolus {i.m.). 
External to the astragalar surface, and se])arated from it by a slight ridge, is a 
roughly semicircular facet (/.') looking downwards and outwards, for union with the 
('xpamh'd lower end of the fibula. 
The tibia is extremely like that of the Dinocerata (except that tin' femoral facets 
are more unequal in size), and differs from that of Klcplias in being shorter and 
