198 ELEMENTS OF ORNITHOLOGY, 
dyles, side by side. On the outer side of the outer condyle 
is a depression into which fits the upper end of the “ fibula.” 
The tibia and fibula are two elongated bones extending down~ 
wards side by side, but of very unequal size. 
The fibula is a quite delicate needle-like bone which below is 
imperfect, pointed, and often anchylosed with the tibia, but 
Fig. 159. 

Ricur Foot or Emeu. 
a, The proximal tarsal element, which is supposed to answer to that tarsal, 
or ankle, bone which is called “ Astragalus” in man and beasts; d,-d,, 
second, third, and fourth digits; m, metatarsals anchylosed together 
into a tarso-metatarsal bone, except at their distal ends; ¢, tibia ; 7, 
the distal tarsal element exceptionally distinct in this bird. 
which somewhat expands and ends freely above, where it fits 
into the notch just mentioned as being situated on the outer side 
of the outer condyle of the femur. In some Penguins, however, 
and sometimes at least in Pandion, the fibula is as long as the 
tibia. 
