PERONEAL MUSCLES IN BIRDS. 



1059 



Ckrysotis and so closely attached to the fasciie of the P. brevis 

 that Dr. Gadow has described it as fused with that muscle. 

 I found a minute but distinct slip to III in Calopsitfacus novce- 

 hollandice, and faint traces of fibres in the direction usually 

 taken by that slip in Caica, Myopsittacus, and one or two 

 others. The P. brevis in Stringops (text- fig. 184) is a stout 

 rounded muscle arising from high up the shaft and passing into 

 a strong rounded tendon, which after traversing two fibrous 

 bridges flattens out to the usual insertion. In most cases, 

 however, it is much stronger tlian the P. longus, arising from 

 the whole length of the fibula below the biceps insertion, from 

 the adjacent area of the tibia and from the tibia distad of the 



Gaslr, \ 



ANCH- 



•PBRE 



--Br.. 



--PS.-J 



Peroneal muscles of Platt/cercus eximius. 



Description and lettering as in Text-figure 179. 



Bv. Fibrous bridge. 



fibula. Its strong tendon usually passes under a fibrous bridge 

 and has the normal flat insertion to the proximal end of the 

 tarsus-metatarsus shaft. Flatycercus (text-fig. 185) shows the 

 most usual condition of this muscle in Parrots. In Trichoglossus 

 and some others the P. brevis is even larger, arising from the 

 head of the fibula proximad of the biceps insertion. 



Pari^ots thus show conditions of the peroneals which link them 

 with the arrangements found in the groups I have already 

 discussed, but as a group are moving away from the normal type 

 in the Ooraciomorphine direction. 



The Cuculiformes retain marked indications of their former 



