650 



MR. W. F. R. WKLDON ON THE 



[Dec. 1 8, 



of which is fused with the flexor perforatus et perforans. This mode 

 of origin is very similar to that of Storks ; while in the Duck, for 

 example, there are two heads attached to the femur, and a third to 

 the ambiens tendon. 



These conditions are shown in fig. 4, p. 649. 



The flexor profundus is perfectly simple both in Storks and in 

 the Flamingo ; while in the Ducks (fig. .5) it has a complicated origin 

 by four heads — namely, one from the femur, one from the outer and 

 one from the inner side of the tibia, and one from the ambiens tendon. 



Fig. 5. 



Am \ 



F.Per 



Ti: 



Origin of flexor profundus in Duck. 

 Ti., insertions to tibia ; other letters as in fig. 4. 



which does not simply fuse with the belly of the flexor, but goes to 

 the tibia, and gives attachment to two distinct fleshy bellies, one for 

 each long flexor. 



The accessory femoro-caudal of Phoenicopterus is extremely small ; 

 and the possession of this muscle together with the absence of a 



