356 MEMOIRS OF THE CARNEGIE MUSEUM. 
more developed than in Moropus; thirdly, the proximal end is less expanded, the 
facets for Me. III are of proportionally greater, and the facet for the unciform 
of less extent than in either Moropus or Nestoritherium. ‘There is no facet for 
Me. V, that element being entirely absent as in Nestorithervum. 
The fourth metacarpal in Schizotherium priscum is on the whole more nearly 
like that in Moropus elatus than in Macrotherium or Nestoritherium. The com- 
parative length of Me. IV in Schizotheriwm is, however, greater than in the American 
genus, though less than in Macrotherium, the latter genus having Me. IV the 
longest. In Schizotherium and Moropus Me. III is the longest. It is further 
worthy of note that the proximal end of Me. IV in Schizotherium priscum is, as in 
Moropus, triangular in its general outline, but the facets for Mc. III are propor- 
tionally smaller and occupy a more lateral position than in the American form. 
The facet for the unciform is relatively larger and is more nearly triangular in its 
general outline than in Moropus. There is a distinct facet for Me. V in Schizo- 
therrum priscum, which occupies a higher position on the ulnar angle than does 
that in Moropus. The proximal end of Me. V probably came in slight contact 
with the unciform in the older Oligocene genus of Europe. 
MEASUREMENTS OF FourTH METACARPAL. 
No. 1604 No. 1700 No. 1424 
(M. elatus), (M. petersoni), (M. hollandi), 
mm. mm. mm. 
Greatestlength= tenes Siete rhe cee it oa ome eae 221 154 
Greatest transverse diameter of head.........................- 50 42 40 
Greatest antero-posterior diameter of head..................-.. 58 38 39 
Greatest antero-posterior diameter of distal end................ 62 38 
Greatest transverse diameter of distal end..................... 55 35 
Metacarpal V (Pls. LX VITI-LXIX).—In the manus under description Me. V 
is not present. This bone is, however, represented in other individuals of the 
collection. No. 2462 is selected for the articulated skeleton, its size being more 
nearly of the right proportion. This bone is reduced to a rudiment. Proximally 
there are two facets for Me. IV on the radial angle, which are separated by a smooth 
low ridge, the anterior facet being the larger of the two. The head quite extensively 
overhangs the shaft in the ulnar direction, giving a curved appearance to the shaft. 
Distally the bone is considerably expanded chiefly in the ulnar direction. There 
is an imperfect facet for the first phalanx, while on the palmar-ulnar angle is a 
large flat facet, presumably for a sesamoid. 
As above stated Me. V is not present in Macrotherium and Nestoritherium, 
while in Schizotherium priscum Me. V was apparently of considerable size judging 
