242 
CORYPHODON. 
The anterior face of the magnum is the smallest in the front of the carpus, 
and is wider than long. That of the trapezoides is next largest, and is 
longer than wide. That of the trapezium is larger still, and is longer than 
wide; ’its distal end is transversely truncate, and the outer side is concave 
and the inner side is excavated by a fossa. The anterior face of the unci¬ 
form is also concave. What I suppose to be the pisiform is an L-shaped 
bone, the long axis terminating in the fr^e tuberous extremity, the trans¬ 
verse limb proximal, and supporting a long, narrow, and longitudinally 
slightly concave articular face for the cuneiform. The metacarpals are 
preserved, except perhaps the proximal part of the pollex. It is true that 
there is an undetermined proximal end of a metacarpus unreferred, but its 
tuberous extremity is so different from the truncate form seen in C. molestus 
and No. Ill, and the total length, when added to the distal portion, being 
greater than in No. Ill, I leave its position undetermined. The distal 
extremity shows the first metacarpus to be the smallest; the second and 
third are subequal and longest; the fourth is a little shorter; and the fifth 
just a little shorter than the fourth. Of the proximal ends, all are truncate 
laterally except the external sides of the No. V and supposed No. I, which 
are angulate externally, marking the extremity of the narrow margin of the 
shaft. The median inferior ribs of the distal ends of the metacarpals are 
obsolete. The phalanges are of the usual form. An unguis is very short, 
with truncate extremity and laterally-produced angles. 
Measurements of the fore limb. 
Total length of the humerus. 
Long diameter of the shaft at the middle .... 
Long diameter of the condyles. 
Antero-posterior diameter of the condyles. 
Length of the ulna from the radial border to the end of the olecranon. 
Width at the radial facets ... 
Depth at the radial facets ...... 
Depth of the olecranon in front. 
Depth of the olecranon at the end. 
Width of the olecranon at the end ....... 
Length of the proximal ends of five metacarpals in place (width of the palm). 
S antero-posterior. 
transverse. 
longitudinal in front. 
M. 
0. 310 
0. 045 
0. 055 
0. 058 
0.128 
0. 050 
0. 064 
0. 060 
0. 027 
0. 040 
0.110 
0. 041 
0.038 
0. 017 
