276 
The American Geologist . 
May, 1896 
to the radius, being more posterior thereto and the styloid 
process is weakly developed. 
The radius (fig. 7) in size bears the same relation to the 
living species as the ulna; the upper one-half of the shaft- is 
transversely compressed, while in the living species this com¬ 
pression is uniformly antero-posterior. The head has normal 
development and is very regularly shaped, particular^ at the 
edges. On account of the transverse compression of the shaft, 
the head projects very considerably beyond and over the in¬ 
ternal shaft line and is placed directly anterior to the coro- 
noid of the ulna and not partly external; this end of the 
shaft does not show the usual tuberosities.. The distal end 
extends somewhat below that of the ulna (the reverse of C. 
familiaris) and rather more anterior than internal to the 
ulna; the articular surface for the carpus is considerably re¬ 
duced, hardly attaining one-half the normal size. 
The manus (fig. 8) is broad and somewhat shortened. The 
transverse diameter of the carpus is equal to that in the living 
C. familiaris of equal size, but the length from the carpals to- 
the phalanges is about 150 mm. or one-fifth-shorter than in the 
above living species, in which the carpus is of the same diame¬ 
ter as that of T. ferox: This diiference in length is due to the 
unusually short metaearpals III and IV. The scaphoid, lunar 
and central are coalesced and have a regular curved superior 
and irregular inferior surface ; the greatest vertical diameter is 
over the magnum; there is a very slight articulation with the 
upper surface of the cuneiform, which bone is more regularly 
shaped than in Can is , neither is it so large nor does it articu¬ 
late partly upon metacarpal V, but entirely upon the unci¬ 
form ; above the trapezium the bone is unusually robust. The 
trapezium articulates to considerable extent upon the side of 
the second metacarpal. It is very regular in shape and has 
its vertical diameter greater than the transverse. The reverse 
is true of the trapezoid, this bone having a plane inferior sur¬ 
face and not curving upward toward the trapezium. The 
magnum is rather transversely flattened and in consequence 
has a proportionately less diameter than C . familiaris and it 
articulates but very slightly upon the side of the second me¬ 
tacarpal. The unciform is of regular shape, with generally 
flat edges, and articulating upon metaearpals IV and V; the 
