1875. ] PLANTAR TENDONS IN BIRDS. 345 
of the tarso-metatarse it is joined by the tendon of the flexor longus 
hallucis on its outer side, whereupon the conjoined tendon splits 
into three divisions to supply the three anterior toes (vide fig. 5). 
The peculiar conformation in the foot of the Trogonide is associated 
with an equally abnormal arrangement of the plantar tendons, which 
I have found in Trogon puella and in Pharomacrus mocinno. In 
these birds the tendon of the flexor longus hallucis is situated, as it 
Fig. 6. 
t=) 
LN 
III 
Momotus lessont. Trogon puella. 
ought to be, external to the flewor perforans digitorum; it also 
crosses it superficially, opposite about the middle of the tarso-meta- 
tarse, sending down a slender vinculum in the normal manner. The 
peculiarity is in the ultimate destination of the tendons, the flexor 
longus hallucis and the flexor perforans digitorum each dividing into 
two near the metatarso-phalangeal articulation, the two portions of 
the former tendon running to the hallux and digit 2, the two of the 
latter to digits 3 and 4 (vide fig. 6). This arrangement is not found 
in any other group of birds, as far as my experience goes. 
Besides the three last peculiar arrangements of the tendons, which 
I have not found elsewhere described, there is another still more 
peculiar and unexpected. I have observed it in all the Anomalo- 
