Zoological Society. 295 
galus (a), is the distal epiphysis of the fibula, and the sole represen- 
tative of that bone. The astragalus and calcaneum conform to the 
ordinary Ruminant type ; according to which, also, the naviculare (s) 
and cuboid (8) are confluent. The ectocuneiform (ce) is a broad flat 
bone supporting the moiety of the cannon-bone which answers to 
the digitus medius (77): a small round sesamoid (s) at the back of 
this joint has not sufficiently distinctive characters to carry convic- 
tion as to its special homology. ‘The outer half of the cannon-bone, 
or metatarsal of the fourth toe (iv), articulates with the cuboid part 
of the scapho-cuboid bone. The second digit (#7) and fifth digit (v) 
are represented solely by the rudiments of their middle and ungual 
phalanges (2 & 3). There are two large trochlear sesamoids (s) 
behind the metatarso-phalangeal joints of the two fully-developed 
Bisel. Fig. 2. 
Bones of fore-foot (Bison europeus). Bones of hind-foot (Bison europeus). 
toes (aii & iv), and one sesamoid behind the last joint of the same 
toes. 
In most artificially-prepared skeletons of Ruminants, more or less 
of the small bones, often regarded as accessory, are lost ; but they are 
really for the most part beautifully indicative of traces of adherence 
to the archetype, and I have on that account particularized them in 
this notice of the anatomy of the Aurochs. 
