FIG. 63. Outer aspect of left pelvic limb of a Raven, show- 

 ing the second layer of muscles. The crurwus 

 and vastus externus are somewhat parted at their 

 lower moieties, and the biceps drawn a little to the 

 rear to show its passage through the tendinous 

 loop. _ Life-size, by the author, from his own 

 dissections. 



