PERONEAL MUSCLES IN BIRDS. 



1071 



A glance at the table (text-fig. 190) will show why anatomists 

 on the hunt for convenient systematic characters would take 



Text-fig. 190. 



Peroneus longus greater 

 than P. brevis, with super- 

 ficial and deep origins, 

 anchor and slip to III. 

 P. brevis functional. 



P. brevis 

 disappearing 



P- longus 

 disappearing 



Diagram of Peroneal muscles in Birds. 

 The ceuti'al space represents tlie condition regarded as primitive in this memoir, 

 the P. longus being fully developed, with superficial and deep origins, anchor 

 and slip to III, and stronger than the P. brevis, which, however, is present and 

 functional. The various enclosures represent the groups of birds indicated by 

 the lettering. Coincidence with the central space indicates that the primitive 

 condition of the peroneals is present : displacement towards the left indicates 

 reduction of the P. brevis, displacement to the right reduction of the P. longus. 



71* 



