EVOLUTION OF THE SKELETON OF EOCENE AND QLIGGCENE TITANOTHERES 



615 



Figure 522. — Calcanea of Eocene titanotheres 



A, Lambdotkerium popogagicum; B, Eotitanops borealis; C, Livinohyops monoco- 

 nusf; D, Palaeosyops robustus; E, Mesatirhinus peter sonif; F, Metarhinus cf. M. 

 earlei; G, f M esatirhinus sp. (Washakie). Astragalocalcaneal facets: ectal (ect), 

 sustentacular (sus), and inferior (inf). One-third natural size. 



Figure 524. — Principal measurements of the carpus and tarsus 



A, Tarsus, transverse and vertical; astragalus, vertical (interior and median); calca- 

 neum, vertical; metatarsal III, vertical and transverse, maximum v/idth near 

 distal end. B, Carpus, transverse and vertical; lunar, transverse and vertical; 

 metacarpal III, height and maximum width near distal end. 



C 



Figure 523. — Left ectocuneiform tarsi of lower and middle 

 Eocene titanotheres 



A, Eotitanops borcaUs; B, Mesatirhinus petersoni; C, Limnohyops monoconus; D, 

 Palaeosyops rohustus. Facets for second metatarsal (II), third metatarsal (III), 

 navicular (nf), cuboid (c&).and mesocuneiform (cn^). One-half natmal size. 



Figure 525. — Humerus, radius, and ulna of Limnohyops 

 monoconus? 



Am. Mus. 11689. Ai Left humerus, radius, and ulna, outer side view; A2, left 

 radius, and As, left humerus, both front view; B, right humerus, radius, andulna, 

 the last two partly restored from Am. Mus. )1699, front view. One-sixth natural 

 size. (Compare fig. 527.) 



