64 BULLETIN UNITED STATES GEOLOGICAL SURVEY. \Yol.Y. 



Measurements of the Carpus — Continued. 



Diameter of lunar face of magnum l antero-posteriorly 0.046 



* transversely 0.031 



Diameter of distal face of magnum \ antero-posteriorly 0.040 



I transversely 0.048 



( antero-posterior 0.080 



Diameter of unciform ) transverse 0.053 



( longitudinal, in front 0.040 



Diameter of lunar facet... (antero-posterior 0.047 



^ transverse (least) 0.016 



Diameter of cuneiform facet { antero-posterior 0.052 



I transverse (behind) 0.028 



Diameter of 4tli metacarpal facet \ f^^tero-posterior 0.044 



( transverse 0.046 



As already remarked, this carpus displays resemblances to some re- 

 cent types, and possesses some which are not known among living 

 Artiodactyla. The inferior face of the scaphoid is narrower from side to 

 side than in the Ruminantia or Sus^ Dicotyles only approaching but not 

 equalling it in this respect. The strong inferior keel of the lunar ex- 

 ceeds that seen in any of the Ruminantia or Omnivora. The pisiform 

 facet is more oblique than in those groups. The posterior tuberosities 

 of the magnum and unciform are larger than those of the genera of 

 either group, while the distinct trapezoides, the slightly shortened mag- 

 num and unciform, and slight decurvature of the cuneiform facet of the 

 unciform posteriorly, are suilline characters. 



The metacarpals are robust, but flattened antero-posteriorly. The rudi- 

 ments of the second and fifth are free, and the latter is the larger. The 

 third has a considerable surface of contact with the unciform 5 its an- 

 terior face displays two shallow fossse, one at each superior angle. The 

 corresponding positions on the fourth metacarpal are occupied by two 

 low bosses. Otherwise the surfaces of the shafts of these bones are uni- 

 form. The phalangeal articular face is well reverted anteriorly and 

 posteriorly, and is not bounded by a transverse depression anteriorly 

 above. The carina is short, though prominent, and extends to the middle 

 of the distal extremity. The lateral distal tuberosities are very low. 



Measurements of the Metacarpals. 



M. 



Length of M. Ill 0.210 



Length of M. IV 0.190 



transverse (total) 0.063 



Diameter of M. Ill proximally , , , . 



' antero-postenor 0.055 



TV. . jTTiT TTT T A n Ctrausversc 0.053 



Diameter of M. Ill distally < 



i antero-posterior (chord) 0. 045 



T^• J. -CUT TT7- • n ( transverse- ...„ 0.054 



Diameter of M. IV proximally < 



i antero-posterior 0.045 



Diameter of M. IV distally (transverse 0.043 



i antero-posterior ( chord) 0. 048 



Length of M. II 0.035 



Length of M.V 0.040 



Diameter of M. V antero-posteriorly 0.021 



