94 



STRUCTURE AND CLASSIFICATION OF BIRDS 



Semimembranosus.^ — Arises from tlie ischium, sometimes 

 trenching a little upon the pubis. It is inserted upon the 

 tibia. The variations which it shows are mainly of size. 

 In Phoenicopterus it is two-headed, and in certain Falcohidse 



^Af^TORlUS 



FUEHlHAt\.a 



Fig. 51. — Leg Muscles of Palamedea, Innee View {aeteeBeddabd 

 AND Mitchell), niLusTRATiNG Biceps and its Sling. 



completely double. It is often inserted in common with 

 the semitendinosus. 



Adductors.^ — These are, as a rule, two broad, flat, fleshy 

 bands, which arise from the pubis, and from the ischium, 

 and are inserted upon the inner edge of the -iemur. The 

 separation between the two parts is less in some birds than 



' ' Iscliio-flexoriuB ' (Gadow). '' ' Pub-isohio-femoralis ' (Gadow). 



