1048 



DR. P, CHALMERS MITCHELL ON THE 



the longus, however, being relatively the larger, but the brevis is 

 actively functional and in addition to its flexion of the tarsal 

 joint has a notable rotating action. 



Text-%. 181. 



P. BRE, 



A NCR 



PLOW. 



P.d.r-- 



Peroiieal muscles in ^x sponsa. 



Description and lettering as in Text-figure 179. 



The Per. longus Las bad the proximal portion removed to show the P. brevis. 



Falconiformes. 



C a t h a r 1 86. Cathartes cmra (2 examples). — The P. longus is a 

 strong muscle, with good but rather narrow superficial origin, with 

 fascial origin chiefly on the side of the tibialis anticus, and with 

 extensive deep origin. The anchor is broad and short and the 

 slip to III is very strong. The P. brevis is very slender, arising 

 only from the distal two-thirds of the fibula, then passing into a 

 rovmded tendon much weaker than the slip to III under which it 

 runs, and then flattens out to the normal insertion. The domin- 

 ance of the longus over the brevis recalls the condition in the 

 Ciconiiformes and dift'ers from that present in Accipitrine birds 

 (excluding Seiyentarius). 



