the osteology of HY/ENODON. 
where the height of the scaphoid reaches its maximum. This facet occupies or. ly 
r Zt of the lu-oximal srrrface of the scaphoid ; on the palmar srde of rt rs a broad 
shelt-like expansion with a roughened surface. On the distal side are thice is- 
tiiictly separated facets, for the trapezium, trapezoid and central respectively, the 
magnum having no contact with the scaphoid. The facet for the trapezium is very 
lar--e mucli tlie largest of the three, of irregular shape and nearly plane. That for 
tl.f i» inucl, tl.e smallrat, and deaennda in front to a. lower level than the 
others, rising somewhat toward the palmar side, and is of triangular shape. The 
surlace for the central is much larger than the trapezoid facet, on the palmar side 
of which it comes in contact with that for the trapezium; it is very oblique in 
position, presenting almost as much toward the ulnar side as distally ; in front it is 
narrow', becoming broader and more concave behind. These three facets do not 
occupy the entire distal end of the bone, though they take up more of it than the 
radial facet does of the proximal end; behind them is a similar, but smaller, rugose 
expansion. On the ulnar side of the scaphoid is a large and slightly convex facet 
for the lunar, which is cut aw'ay behind by that for the central. 
The lunar is a small bone, inferior to the scaphoid in every dimension except 
the vertical, in which it considerably exceeds the latter. The radial facet is very 
strongly convex in the dorso-pahnar direction and is reflected farther down upon 
the dorsal face of the bone than in the scaphoid, but not extending very far tow ard 
the palmar side. Behind this radial facet the proximal surface of the lunar descends 
steeply toward the palmar side, and is quite rugose. The lunar has no distinct facet 
for the cuneiform, but on its internal side is a concave facet, into which the scaphoid 
fits, interlocking the two bones very firmly. Distally the lunar bears three facets, 
for the central, magnum and unciform respectively, all of which are narrow and 
concave in the dorso-palmar direction. The facet for the central is widest in front, 
narrowing posteriorly, and is lateral rather than distal in position. The magnum 
facet is very narrow and somewhat oblique with reference to the dorso-palmar axis 
of the bone, inclining toward the radial side as it passes backward. The unciform 
surface is slightly the largest of the three and much the most decidedly concave. 
The lumar is of almost uniform breadth throughout, in height it increases somewhat 
to the ulnar side. 
I lie cuncifmt is a large square bone, considerably exceeding the lunar in size, 
broin the extaaial border it gives off a strong, recurved, hook-shaped process. The 
proxniial siirlaco kars a groove-like facet for the ulna and on the palmar side is a 
large laeet lor the pisiform The distal end is occupied by the facet for the unci- 
oii , this IS siiildlc-shaped, being broad and concave on tbe radial side, becoming 
Tr ! iii," I™”'* “r »f tl.e ciinei- 
at? 71 rt opti aX^ t ‘“'d bears two distinct facets, which meet 
two and is sligbUy convex, ^hk tint 
