PAL.EOSYOPS LEIDY, AND ITS ALLIES. 
3(i:l 
lar in outline, the apex being placed anteriorly and oflering only a slight articnhi- 
lation for the magnum. The other inferior facets of tlie unciform are as in palit- 
dosus, although the unciform-metacarpal 111 facet is larger proportionately than in 
that species. The facet for metacarpal V is large, taking up about one-third of the 
inferior surface of the bone. 
Metaca^'pals. — The metapodials in Lyntnohyops laticeps are rather long and 
slender', and their shafts are almost straight. The metacarpal region is more compact, 
and the digits do not diverge from each other as much as in P. paludosus. The .«haiK* 
of the proximal part of metacarpal II is rpiite charactei'i.stic ; it enlarges gradually 
as it approaches the articulating surface of the bone, its intei'iial Irorder Ixdng n»ngh 
for muscular attachment. The external border sends u}) an ascending pnn'c'ss for 
articulation with the magnum and metacarpal 111. The superior facet ol’this meta- 
carpal is triangular in form, its external border being very obli(pie, and forming with 
the internal the apex of the triangle. The metacarpal ll-magnum facet is long aiul 
narrow; it is very oblique in position from before backward, and inclined lixnn the 
vertical from above downward. The metacarpal I l-metacarpal 111 facet is c(»nlined 
to the anterior part of the bone, it is situated under the anterior half «)r the facet 
just desci-ibed, and is tongue-shaped in outline, the larger i)art lx*ing in fmnt. 
Upon its radial side this metacarpal exhibits a small Hat facet lln' the tuiin*/.- 
ium. The form of metacarpal III is characteristic of L. laticeps. It is long, straight 
and slender, its distal portion being slightly enlarged, and provided as in the other 
metapodials with a j)rominent keel. The third metacarpal d<H‘s not show a.s much 
disproportion in size to the fourth in L. laticeps we see in the nianus of the 
Tapir. In the latter the metacarpal III transmits a larger proportion of the weight 
than in Litmiohyops. The superior facet of metacarpal III for the inagnmn is nan-ow 
from side to side, but ver}' deep from before backward; its anterior laa-tion is 
slightly convex, the posterior half of the facet being inclined downwanl and termin- 
ating in a triangular point. On the radial side this metacarpal shows a small and 
anteriorly placed facet for metacarpal II. The ulnar side of the third metacarpal 
exhibits a large process, the form of which is S(Hiare. with a large, Hat 
and oblique surface for articulation with the unciform. The metacarpal III- 
unciform facet is very large compared with the size of this im-tacarpal. 
comparatively much larger than in the Tapir or Hhinoceros. Ihdow the latter 
facet this metacarpal shows two large oval facets for metacarpal IV. They 
are not continuous, and are Avidely overhung by the process alKue descrilH-d. 
The relation of metacarpal III to the magnum and unciform is dillerent from that 
■ of the Tapir’s carpus. Owing to the separation anteriorly of the t\v«> latter carpal 
elements in L. laticeps a greater proportion of the unciform transmits its weight to the 
median digit, whereas in the Tapir a larger proportion of this weight is transmitted 
through the unciform to the metacarpal IV. Metacarpal D' like that of the Tapir 
is slightly curved toward the ulnar side of the carpus, but differs from the latter in 
48 JOUR. A. N. S. PHILA., VOL. XI. 
