Temnocyon and Ilypotemnodon .— Eyerman. 277 
bone not only covers the fifth metacarpal but projects beyond 
it on the external side. In the metacarpals an interesting 
feature is the presence of an unusually well-developed pollex. 
which has the extraordinary length of 45 mm., or over one-half 
the length of the third metacarpal. As is usual it articulates in 
a different plane from metacarpals II-IV. The second meta¬ 
carpal is proportionately shortened. The third and fourth 
are of normal size. The fifth is somewhat shorter than in the 
living species and contrary to the usual method articulates in 
a different plane from metacarpals 1I-IY, and more in a plane 
with metacarpal I. 
The Pelvic Girdle — The pelvis is not so robustly developed 
as in the living species, neither is the width across the supra- 
iliac border so expanded, being more or less compressed and 
measuring 67 mm ; the innominate bone, with the exception of 
the diameter just above the acetabulum, is rather more slen¬ 
der. The acetabular and pubic borders are more or less par¬ 
allel and do not curve toward each other, as they approach 
the acetabulum. The crest of the ilium is less curved, the 
diameter somewhat less and from the acetabulum to the pubic 
symphysis it is rather more elongate and narrow than in the- 
living species; the symphysis of the pubis is narrow. The 
iliac surface from the acetabulum to the crest measures 91 mm. 
The Hind Lim,h .—The length of the femur is 247 mm. A 
vertical line being drawn from the internal edge upward will 
pass through the middle of the notch between the head and 
the trochanter, whereas in the living C. familiar is this line in 
the same direction will pass through the middle of the head,, 
the bone curving inward to a greater extent as it reaches the 
head, which must therefore be more defined ; this is caused by 
the almost vertical external edge in T.ferox and by the in¬ 
ward curve of the bone in the living species. The femur, 
therefore, in the former species curves inward only, and in the 
latter the external edge outward and the internal edge [.in¬ 
ward ; the greater trochanter does not project beyond the 
shaft line; the notch which forms the neck between the head 
and the trochanter is rather wide; the diameter of the head 
is 22 mm. and that of the neck 19 mm., both proportionately 
somewhat less than in the living species; the distal end is 
unfortunately badly contorted, but measures about 43 mm., the- 
shaft here inclining backward. 
