298 



Royal Society : — 



tendons unite into a common tendon halfway down the posterior 

 side of the canneon bone of the bird. 



The cross sections of these two muscles are shown in the 

 annexed figures, taken as in the human subject (figs. 7 and 8). 



Fig. 1. Fig. 2. 



Biceps (long head). 

 Fig. 3. 



Fig. 4. 



Biceps 

 (short head). 



Fig. 7. 



Flexor pcrforans. (Rhea.) 



Fig. 8. 



Semiten din oiii:s. 



Semivicmhranosus. 



Fig. 5. 



Flexor hallvcis. (Rhea.) 

 Fig. 6. 



Gracilis. 



Sartorius. 



The areas of these cross sections were found to be as 245 to 

 160 ; or the less was 65 per cent, of the greater. 



