24 Leach, The Myology of the Bell-Magpie. [,,f"]\ 



111. The peroneus longus. 



112. The tibialis anticus. 



113. The extensor longus digitoriim. 



114. The extensor hallucis brevis. 



115. The tibialis posticus. 



116. The flexor perforatus indicis secundus pedis. 



117. The flexor longtis hallucis. 



118. The flexor perforatus annularis primus pedis. 



119. The flexor perforatus medius primus pedis. 



120. The flexor perforatus medius secundus pedis. 



121. The flexor perforatus indicis primus pedis. 



122. The flexor perforans digitorum profundus. 



109. The gastrocnemius [33] is a very large muscle ensheathing 

 most of the middle leg. Strepera agrees with the American Raven 

 as described by Shufeldt. This muscle is made up of three large 

 divisions. The first, the external head, arises on the outer 

 condyle of the femur by a short, strong tendon. It then becomes 

 a spindle-shaped muscle merging into a tendinous expansion 

 about two-thirds of the way down the tibia. The internal head 

 arises from the outer surface of the inner condyle of the femur ; 

 it is broad and fleshy. The distal end of the adductor magnus 

 (108) makes a tendinous connection with it close to its origin. 

 Its fibres run down the back of the leg, and merge into the 

 tendinous expansion of the external head. The tibial head has 

 a broad fleshy origin from the summit of the tibia and the edge 

 of the procnemial crest, and is the largest of the three divisions. 

 Its fibres converge low down, become tendinous, and join the 

 tendinous expansion previously mentioned. The common broad 

 tendon develops a flattened cartilaginous plate that rides over 

 the true tibial cartilage. The tendon passes on and merges into 

 the strong fascia that binds about the tarso-metatarsus. 



no. The soleus [36] is under the tibial head of the gastrocnemius 

 (109). It arises in the cnemial crest, and is overlain below its 

 origin by the insertion of the semimembranosus (102). It soon 

 converges and becomes tendinous, sending down a long, thin 

 tendon to the proximal end of the tibial cartilage. 



111. The peroneus longus [34] is a very large muscle which covers 

 the front of the leg. It arises from the cnemial crest, and the 

 fascia that covers the knee-joint. The fibres, very tendinous on 

 the inner side, fit closely round the leg, run down to and become 

 a small tendon. This bifurcates and gives one short branch to 

 the upper part of the tibial cartilage. The smaller branch goes 

 to the outer side of the tarso-metatarsus, and joins the tendon 

 of the flexor perforatus medius primus pedis (119). Thus, the 

 peroneus longus assists in flexing the toes in Strepera as in the 

 Raven. 



112. The tibialis anticus [35] arises as two distinct heads — the 

 larger on the front of the tibia up between the cnemial crests, 

 the second from a depression in the ridge of the outer condyle of 



