2 



piCAEia; 



(b) Galline, in which the flexor perforans digitorum supplies the 

 second, third and fourth toes as before, while the flexor longus 

 hallucis is connected with it by a vinculum and supplies the hallux 

 only, or any one or more of the other digits as well (fig. 26). 



dorsal nec/c-traet. 

 .'for/c of necAtracC. 



spinal-tract. 



Pig. 1. — Diagram of a Pigeon, witli the feathers removed to how the 

 arrangement of the feather tracts (after Nitsch). 



-^'^-v/>'^^'^""\y/""'^'''"\/-''^''"''' "li-^^"'^'^^^ \ f^>''y^^i -^z"'- 



Fig. 2 — Diagram of the modifications of the deep plantar tendons of the 

 feet of birds : flh. flexor longus hallucis ; fpd, flexor perforans digitorum ; u,, 

 Passerine ; b, Galline ; c, Trogonine ; d, Pioine ; e, Coraciine ; /, Upupine. 



(c) Trogonine, in which the flexor perforans digitorum supplies 

 the third and fourth toes only, the flexor longus hallucis leads to 

 the first and second, and is also connected with the flexor perforans 

 digitorum (fig. 2c). 



