Tidin'! ARY VEKTERRATA OE THE EAYC.H. 
portion of llio iniK'r facet tlie suiface of llio bone slo])CS strongly downwards 
towards tlu^ not vc'ry jn’oniincnt but massive cnemial crest {cn.). Immediately 
benea.Ili the ])ost('ro-external angle of the ])roximal end of the bone is a broad 
lacet (/.) for union with the n])])er end of the fibula. Beneath the cnemial crest 
tlu! shaft is trilu'dral ; its posterior face is nearly flat, the antero-external first 
concaue, then towards the middle of the bone fiat, the antero-internal rounded. 
'I'lie 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. 
(■(.sO, HUiTace for .a.«1r<ag;ilns ; cn., ciKMiiial ore.st ; f., .surfnee for proximal end of fibula : f.', surface for disfal 
end of fibula; /., inner surfac(; for femur; i.in., internal malleolus; e., outer surface for femur. 
] nat . size. 
('ltd is occupied by the slightly concave surface for the astragalus [ciHt.). 'I'his is 
produced somewhat downwards into a point ])ostcriorly and much more strong!) 
internally, where it runs down on to the face of the blunt internal malleolus {i.m.). 
External to the astragalar stirface, and separated from it by a slight ridge, is a 
roughly semicircular facet (/.') looking downwards and outwards, for union with the 
('xpanded lower end of the fibula. 
'I'lie tibia is extremely like that of the Diuocerata (exce])t that the femoral facets 
are more unequal in size), and difl'ers from that of lUcjiha^ in being shorter and 
