PERONEAL MUSCLES IN BIRDS. 



1053 



a Green-backed Porphyrio, gives the arrangement usual in the 

 Family. 



Gruidpe. Gruinse. Grus australasiana. Anthropoides virgo. 

 Balearica chryso23elm'gvjS. — In the Cranes the P. longus is rather 

 large with extensive superficial, fascial and deep origins, very long 

 tendon sometimes ossified, very wide anchor and good slip to III. 

 The P. brevis is joresent and arises from nearly the whole length 

 of the fibula but is very weak. The tendon, sometimes ossified, 

 has the usual insertion by a flattened extremity which passes 

 under both the slip to III and a very long tarsal ligament. 



Text-fiff. 183. 



A/VCK 



Peroneal muscles of PorpJiyrio porpliprio,. 



Description and lettering as in Text-figure 179 (p. 1041). 



Br. Fibrous bridge. 



Araminse. Aramus scolopaceics. — The P. longus is large with 

 superficial and fascial origins but without deep origin. It has a 

 stout anchor and good slip to III. The P. brevis is either 

 altogether absent or represented by a very small ligament. 



Psophiinae. Psoj^hia crepitans, P. leucoptera, and P. obscfiira.- — 

 The P. longus is large with chiefly superficial and fascial origins. 

 The anchor is broad and the slip to III is present and stout, but 

 peculiar in so far as after giving ofii" a stout anchor to the per- 

 forated flexor of III in the region where it usually fuses with that, 

 it passes on and joins much more distally the tendon of the 

 perforated and perfoi'ating flexor of the same digit. The P. brevis 



Proc. Zool. SOC.--1913, No. LXX. 70 



