Page 343. 
292 ON THE DEEP PLANTAR TENDONS IN BIRDS. 
the main continuation outwards of the insertion of the muscle into 
that of the flezor perforans digitorum, the slip to the great toe being 
but small compared with it. In the Dorking Fowl the flexor longus 
Fig. 3. Fig. 4. 
il 
Tinnunculus alaudarius. Buceros rhinoceros. 
hallucis tendon splits into two (after it has given off the vinculum 
to the flexor perforans), one resulting portion going to the normal 
hallux and the other to the supplementary toe, which is therefore a 
hallux also, as is generally supposed. 
This manner of distribution of the deep plantar tendons, which 
is that found in a great number of birds, may be summarized as 
follows :—The flexor perforans digitorum splits opposite the meta- 
tarso-phalangeal joint into three tendons, one running to the ungual 
phalanx of each of the three anteriorly directed toes. The flexor 
longus hallucis is inserted into the ungual phalanx of the hallux, but it 
sends downwards near the middle of the tarso-metatarsus a vinculum 
to join the tendon of the flexor perforans digitorum just before the tri- 
furcation of that muscle (figs. 1 and 7). 
This condition is fonnd in the following birds which I have 
examined :— | 
Gallus bankiva. Musophaga violacea. 
Megacephalon maleo. Schizorhis africana. 
Fulica atra. Orotophaga sulcirostris. 
