24 



THE AMERICAN NATURAUST. [X oi . XX.W 1 1 I. 



reversal of this act, and the toes being turned, and to some 

 extent the tarsus, the maximum amount of surface thus afforded 

 is brought into play as in an oar. Femur and tarso-metatarsus 

 have about equal lengths, and they each equal half the length of 

 the leg-bones, measuring from the apex of the patella to the mid- 



lo^^ 



of the 



of the distal tibial con- 

 dyles {Podilymbns podi- 

 ccps). The mid-anterior 

 toe in the adult meas- 



5-5 



and the 



; these are about 

 il proportions. 

 The head of the fe- 

 is large, and much 

 excavated for the round 

 ligament. At the sum- 

 mit the articular surface 

 is rounded, and the tro- 

 chanter does not rise 

 above it. Its shaft is 

 very slightly bowed to 

 the front, and its con- 

 dyles markedly promi- 

 nent behind, with an 

 unusually distinct and 

 gaping cleft for the 

 head of the fibula. 



One of the most im- 

 portant characters of 

 >ion of its cnemial crest, 

 ss considerably above the 

 le with the forepart of it. 



the tibio-tarsus is the upward ext 

 which is carried up to an apical pr^ 

 summit of the shaft, but in direct 

 A large patella backs this at its supero-external aspect, 

 something of the same form as the cnemial crest, abov 

 it is slightly extended when articulated in situ. The pre 

 ridge of the tibio-tarsus is extended as a sharp border di 



It has 



