MUSCLES OF THE HIND LIMB 



101 



(2) In Apteryx, &c., the vinculum is very strong, and 

 forms the direct continuation of the tendon of the flexor 

 hallucis ; the tendon to the hallux has the appearance of 

 being a branch of this (fig. 55). 



(3) In many Accipitres the flexor hallucis divides into tvi^o 

 parts at the lower end of metatarsus ; one of these goes to hal- 

 lux, the other blends with the branch of the flexor communis 



Fig. 56. — Tinnunculus 

 alaudarius (afteb Gakrod). 



Fig. 57. — Buceros rhinoceros 

 (after Gakbod). 



which supplies digit II. ; there may be in addition a strong 

 vinculum, uniting tendons before their splitting (fig. 56) . 



(4) In Bhea, Phoenicopterus, &c., where hallux is small 

 or absent, the two tendons are present, but fuse together, 

 branching later to supply the digits present. 



(5) In Buceros, Podargus, Sarcorhamphus, &c., the two 

 tendons fuse completely before supplying the digits (fig. 57). 



(6) In Megalcema, BhamphastidcB, &c., the vinculum 

 is present, but flexor digitorum supplies only digit III., 



