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Part I. — Dissection of Leg of Crocodile. 



On removing the skin and dissecting away the fat, the muscles 

 shown in Tig. 19 are exposed. 



Fig. 19. 



left leg of crocobile (with skin removed, to show the superficial muscles). 



a, Rectus femor 



b, Glutceus maximus. 



c, Agitator caudce. 



d, Biceps femoris, 



e, Semitendinosus. 

 /, Semimembranosus, 

 u, Gastrocnemius. 



x, Plantaris. 



y, Peronceus longus. 



x, Tibialis antkus. 



1. If. Glutceus maximus (£), 0*15 oz. 



Origin ; from central half of the ilio -ischiadic line. 

 Insertion ; into the fascia outside and above the knee joint. 



This is a broad flat muscle, and straps down the tendon of the rectus 

 femoris in its passage over the knee. 



2. M. rectus femoris (a), 0*08 oz. 



Origin ; from anterior spine of the ilium, close to the acetabulum. 



Insertion ; as in the leg of the Ostrich, into a tendon passing over 

 the knee outwards, and terminating in a remarkable muscle* (x), 

 in the calf of the leg, associated with the gastrocnemius (u), and 

 deriving a second origin from the agitator caudce (c), as shown 

 in the figure. 



* This muscle may be the plantaris. 

 R. I. A. PROC. — VOL. IX. 



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