EOCENE BINDS. 
71 
•whicli is possibly the sutural articulation of the proximal end of the meta¬ 
tarsus of, the hallux. No such surface exists on the corresponding bone of 
the Ostrich or Emeu. Only two of the free distal phalangeal extremities 
are preserved. The shaft is broken, showing that its interior is filled with 
cancellous tissue. The free extremities are remarkable for the great inferior 
extent of the articular trochlear face. The median is strongly grooved 
with an obtuse excavation, and the lateral or bordering ridges are equal and 
rounded. The groove is continuous with the superior surface, but not with 
the inferior. There the convergent lateral ridges inclosing the open groove 
terminate in an abrupt elevation above the adjacent surface of the shaft. 
Tlie sides at this point are concave. Tlie inner free condyle has an 
oblique articular face; the external ridge dropping away internally, as in 
many Birds, and produced beyond the inner ridge distally. The articular 
face becomes then a part of a spiral, and is little grooved above, but strongly 
grooved medially. The vertical diameters of the sides differ, the inner 
being much greater, and both are concave. A strong foramen pierces the 
shaft just within the point of junction of the inner and medial free extrem¬ 
ities. 
Tornsverse diameter of the proximal end of the tarsometatarsas. 0.100 
Antero posterior diameter of the same (partly inferential)... 0.070 
Interval between penetrating foramina on anterior face of shaft. 0. 071 
['long diameter. 0. 050 
Median distal cond 3 le< vertical diameter. 0.018 
t transverse diameter.... 0. 010 
pong diameter . 0.037 
Internal distal condyle< vertical diameter. . . 0. 040 
^transverse diameter. 0.031 
The large size and wide separation of the penetrating foramina, and 
the thin internal edge with suture-like facet, distinguish this form as 
distinct from any of the genera of Stnithionidce and Dinornithidce. 
