PALJ50SY0PS LEIDY, AND ITS ALLIES. 
385 
ascending ramus is high. The symphysis is long and constricted at the diastema. 
The canines are round in section and wide spreading. The pi'otoconid of premolar 
2 is much higher than in the other premolars. It has a well developed heel. The 
true molars show their primitive character in having low crowns, with the crests of 
the V’s low, and the valleys shallow. The characters of the last inferior molar are of 
interest ; and its posterior tubercle is more reduced than in any species of the 
genus. 
Humerus . — The humerus is slightly shorter than in Tapirus Amertcajitts, 
but the extent of its proximal and distal surfaces much less. The middle portion 
of the shaft is slender. The deltoid ridge extends far down upon the shaft, and its 
external border is prominent. The trochlem are very narrow transversely, with a 
prominent rounded ridge dividing the external from the internal. 
Femur . — The femur is much shorter than that of the American Tapir ; its 
shaft is long and slender. The lesser trochanter is prominent. The third tro- 
chanter is elongated and thin. As in all the species of PaUeosyops the p(»sten>- 
inferior face of the femur is flat and shows no fossa for miuscular insertion. 
Mamis . — The carpus is about as broad as high. The lunar has a large contact 
with the unciform, but does not penetrate below as in Limnohyops. 'Tlie magnum 
is very high and narrow, and only has a small contact with the lunar. The unci- 
form is Tapiroidin form, and its horizontal axis is rotated more upward than in the 
other species of the subfamily^. As a result of these carpal relations the unciform- 
lunar contact is a large one. Indications are that the outer digit of tliis sjaTies 
was more reduced than in L. laticeps-, and the axis of the manns pa.sses through 
metacarpal III (Mesaxonia). The metapodials are wide spreading and slender. 
From the measurements of the jaw and limb bones, we may conclude that fhisgrace- 
ful species must have been about one-fifth smaller than the Brazilian Tapir, but the 
diameter of the limb bones and the light construction of the man us prove that it 
was lighter built and more agile than any of the recent species of Ta[)ir. 
MEASUREMENTS, PAL^EOSYOPS BOREALIS, NO. 290. 
Length of jaw 
Depth below middle of molar 3 
Entire inferior molar series 
Length of manus without phalanges 
Length of carpus 
Breadth of carpus 
M. 
■ 20 (» 
•040 
•128 
•117 
•034 
•035 
Length of humerus . 
Breadth of distal surface 
Length of femur 
