354 



RLE ME NT A R Y ANA TOM Y. 



[LESS. 



in many forms, e.g. Hyrax, pass behind and beneath it into 

 the plantar fascia. 



The soleus, even in Nycticebus, has lost its tibial attach- 

 ment, is entirely muscular, and blends with the gastro- 

 cnemius. It may (as in the Agouti) arise from the tibia only ; 

 it may be inserted into the astragalus, as in the Ornitho- 

 rhynchus ; or it may be wanting, as in the Pig, Hyaena, Seal, 

 ancLothers. 



FIG 316. DEEPER MUSCLES OF BACK OF RIGHT LEG OF PARSON'S CHAMELEON 



Plantaris. This muscle may be altogether absent, as in 

 the Wombat. It may however be present as a large belly, 

 and arise from the outer condyle of the femur, as in the Pig 

 and Rabbit. It may also, as in the same animals, end in an 

 expansion which runs along the sole and becomes the per- 

 forated tendons of the digits. This muscle may be con- 

 nected even with the pelvis by the intervention of the rectus 

 femoris, the tendon of which is continued on into it, not only 

 in Birds but also in the Alligator. It may be intimately 

 connected with the outer head of the gastrocnemius, and fleshy 

 bellies may replace the perforated tendons, as in the Iguana. 



The popliteus may arise from the head of the fibula, even 

 in man's own class, e.g. in the Echidna, where it extends far 



