80 



BULLETIN OF THE 



td*m 



Lci+* 



trapezo-niagnuin ; its proximal surface is divided obliquelj'- into facets for the 

 lunar and cuneiform. The unciform projects below the level of the trapezo- 

 magnum, and so presents upon the radial side u small facet for the corresponding 

 projection of mc. III. 



The metacarpus consists of the III. and IV. metacarpals, which have coalesced 

 to form a cannon-bone, and the II. and IV., which are very slender, styliform 



bones, perhaps interrupted in the middle of the 

 shaft. The cannon-bone is more slender than 

 the anterior one of Cosoryx figured by Cope 

 (Am. Nat., 1881, p. 547). The proximal sur- 

 face is unequally divided, considerably the 

 larger part belonging to mc. III., which pro- 

 jects above the level of mc. IV., and so comes 

 into contact with the unciform. This arrange- 

 ment oc'-urs also in Dremothcrium (see Gaudry, 

 Enchainements, Fig. 1-12), and to a much less 

 degree in Antilocapra. The shaft of the can- 

 non-bone is broader and flatter jjroximally, be- 

 coming narrower and more rounded distally, 

 and the distal trochlea; are completely encircled 

 by sharp keels, as in existing ruminants. On 

 the posterior side of the proximal end are two 

 small facets, probably for the heads of the lat- 

 eral digits. At all events, much of the shafts 

 of the metacarpals II. and V. were preserved 

 in the shape of very slender and compressed 

 splint bones. 



The phalanges are long and slender, and so 

 asymmetrical as to produce a decided conver- 

 gence of the toes. The proximal ends of the 

 first row are deeply grooved for the keels of the 

 metapodials, but are not emarginated in front 

 as are those of the recent Pecora. The ungual 

 phalanges differ from those of the deer and an- 

 telopes only in their greater slenderness. The 

 phalanges of the lateral digits are of about the 

 same proportionate size as in existing Cervidce. 

 The tarsus is also cervine in character, and differs little from that oi Falce- 

 omeryx (Cervus) Flourensianus as figured by Fraas (Fauna von Steinheim, 

 Taf. VIII. fig. 24). The astragalus is high, narrow, and deeply grooved, and 

 the distal end shows hardly more than an indication of the ridge which passes 

 between the navicular and cuboid. The calcaneum is long and much compressed, 

 though with considerable depth, antero-posteriorly in the lower third (in Palce- 

 omeryx the calcaneum is thicker and more rounded) ; the cuboidal facet is 

 narrow, pointed in front and quite concave from before backwards ; the sus- 



i^: 



Figure 8. — Manus and pes of 

 Blastomtryx X f . 



