TEIPLOPUS. 685 



carpal facet of the radius is contracted, and has three times the superficial 

 area of that of the ulna. The scapholunac dividing ridge is present, but is 

 very low. The scaphoid face is the more excavated, and then rolls back- 

 wards, forming a very nan-ow posterior facet, which is narrower than that 

 found in the species of AncMtherium. There is no distinct fossa on its 

 inner or posterior border, as in many ungulates. The trapezium and 

 scaphoid are the only bones of the carpus which are wanting Tlie latter 

 is pi'obably wider than long or deep, wliile both the lunar and cunei- 

 form are longer than wide. The cuneiform has not its external border 

 excavated ; its proximal surface is oblique and continuous, tlie ulnar and 

 pisiform facets being in line. The pisiform is large, and is enlarged dis- 

 tally ; its proximal facets are equal. The exposed face of the trapezoides 

 is rather larger than that of the magnum, and is nearly as large as its own 

 face of contact with the latter. The magnum has the usual great antei'O- 

 posterior extension, with elevated posterior convexity applied to the fossa 

 of the lunar. Its posterior process is long, nearly equal to the rest of the 

 bone, and is depressed and flattened distally. The metacarpal facet is very 

 concave. The unciform's anterior or exposed face is a little longer than 

 wide. Its two proximal facets are about equal. It is about as deep as 

 wide, and extends half its length distad to the magnum. Its posterior pro- 

 cess is rather narrow ; it is narrow and abruptly decurved Distally, the 

 facet for the fifth metacarpal is well marked, and has about half the area 

 of that for the fourth metacarpal. The functional metacarpals are of 

 moderate length as compared with the elongation of the ulnoradius. The 

 third is largely in contact proximally with the unciform as well as with 

 the magnum. The condyles are stout, aiid each is laterally impressed by 

 a fossa. The second and fourth have chiefly lateral presentation, but are 

 not much narrower in the shaft than the median metacarpal. The first 

 phalange of the lateral digit is a little shorter tlian that of the median, 

 while the seconds are of equal length. Ilie extrerait}^ of the second digit 

 reaches the proximal third of the length of the median ungual phalange. 

 The fissure of the ungual phalange reaches the middle of its length. The 

 fifth metatarsal is proximally rather stout ; but it soon contracts to a thin 

 rounded extremity at only one-fifth the length of the fourth. 



