246 MEMOIRS OF THE CARNEGIE MUSEUM 
Tibia (Pl. LXXXI).— The tibia is represented by the distal ends and the 
greater portions of the shaft of the right and left, but the proximal ends were unfortu- 
nately broken off and lost. The shaft is rather heavy and was apparently quite 
short. The cnemial crest extends well down and the shaft immediately below this 
crest becomes triangular in cross-section, with the acute apex of the triangle directed 
forward. The areas for the different muscles are well defined by distinctly marked 
ridges, the one on the posterior face which separates the flexor longus digitorum 
from the flexor longus hallucis being especially prominent. On the distal end the 
groove for the tendon of the tibialus posticus is well developed, and the internal 
malleolus is very large asin Daphwnus. The astragalar articulation is not so deep 
asin the recent dogs; it is also more oblique, and does not have the transverse 
sulcus which interrupts these facets in Canis. On the fibular face is a well formed 
facet for the distal end of the fibula. 
MEASUREMENTS OF TIBIA. 
Mm. 
Greatest length, approximately. Pee est 200 
Antero-posterior diameter of shaft at lower end of cnemial Crest..........---cssssseseesseeseeseasneseeeseresseess 2D 
Transverse diameter of shaft at lower end of cnemial Crest............0..ceeesecssemsrsssesseseessnsseesenseceseseree LT 
Greatest antero-posterior diameter of distal end..... 19 
Greatest transverse di ter of distal end é 34 
“ibula (PI. LX: X XT).—Asin the tibia the proximal end of the fibula isalso broken 
oft and lost. In proportion the shaft is somewhat more slender than is the case 
in Daphenus, and has a double curvature ; its proximal portion sweeping toward the 
shaft of the tibia, while more distally it again curves outward and presents a rather 
short arch before meeting the articular facet for the tibia. As on the latter bone 
the surfaces for the different muscles are well defined by prominent ridges. The 
distal end is much expanded. The groove for the peroneus longus is well defined, 
as is also that for the peroneus brevis and tertius. The two grooves are separated 
by a prominent tubercle (outer malleolus) similar to that in the lion and quite 
unlike that in Canis where the groove for the peroneus brevis and tertius is very 
much less developed and the malleolus enlarged. On the tibial face there isa large 
round facet for the astragalus, which is gently convex in all directions. Immedi- 
ately above this large facet for the astragalus is a smaller facet for the tibia, which 
is plane and fits perfectly against a corresponding facet on the external face of the 
tibia. 
MEASUREMENT OF FIBULA. 
Mm. 
Greatest length, approximately tied cease Wirtstervente OO) 
Antero-posterior diameter of distal end 19 
Transverse diameter of distal end stoped 10 
