PAL^OMASTODON PAEVUS. 



167 



These remarks apply likewise to the tibia of P. headnelli. The dimensions (in centimetres) 

 o£ this bone are : — 



Extreme length 38*8 



Width of proximal articulation (for astragalus only) .... 11'5 



„ middle of shaft . 5'3 



,, distal articulation 6 



The length of the tibia of P. beadnelli is 63"5. 



Text-fig. 58. 

 icfL. 

 o. 



im. 



Eight tibia of Talceomastodjon (1) parvus : A, from front ; B, proximal end ; 0, distal end. 



as., surface for astragalus ; en., cnemial crest ; /., /.', surfaces for fibula ; i., surface for inner condyle of femur ; 

 ic.p., intercondylar process ; i.m., internal malleolus ; o., surface for outer condyle of femur ; p., internal 

 distal prominence. 5 nat. size. 



Text-fig. 59. 



A. 



Left astragalus of Palceomastodon (7) parvus : A, from above ; B, from below. 



a-i., ectal facet; i.m., surface for internal malleolus of tibia; nav., navicubr facet ; siis., sustentaoular facet ; 



tib., tibial facet. |- nat. size. 



