702 MR. p. G. PAIISONS ON THE [Juiie IG, 



up to the external condyle of the femur ; but, as the muscle has 

 contracted attachments similar to those found in Man to the fibula, 

 the upper tendinous part of its origin takes on the function of a 

 ligament. The muscle is inserted in the usual manner into the 

 two outer toes. 



The Peroneus lonc/us rises from the head and upper quarter of 

 the fibula, as well as from the ligament already mentioned, 

 belonging to the extensor longus digitorum. It is inserted into 

 the entocuneiform. 



The Peroneus hrevis is absent. Macalister, however, found it in 

 the Great Kangaroo and Bennett's Wallaby. 



Tlie Peroneus quarti digiti is very small and runs from the 

 second quarter of the fibula to the great fourth toe. 



The Peroneus qidnti diyiti equals the peroneus longus in size ; it 

 rises from the upper third of the fibula and runs to the outermost 

 toe. All three peroneals pass through the same synovial sheath 

 and groove on the back of the external malleolus. 



The Gastrocnemius has the usual two heads, the outer of which 

 has three origins: (1) a small head from the outer side of the 

 patella ; (2) larger, from the same place, and separated from the 

 last by the external popliteal nerve ; (3) from the large fabella 

 over the external condyle and from the external semilunar 

 cartilage. Tiie inner head is normal in origin and has no fabella 

 developed in it. 



The Soleus is absent, unless the origin of the gastrocnemius 

 from the semilunar cartilage represents it. Meckel also describes 

 it as wanting. 



Macalister found the fibular head in the Great Kangaroo and 

 Bennett's Wallaby. 



The Plantaris comes from the external fabella and the back of 

 the external condyle ; it soon forms a tendon which passes round 

 the tuberosity of the calcaneum, after which it divides into a large 

 internal and a small external portion. The small slip runs to the 

 outer toe, is pierced by the flexor longus digitorum tendon, and is 

 inserted into the outer side of the second phalanx. The large 

 inner portion gives off a tendon from its outer side which is 

 attached to both sides of the proximal phalanx of the outer toe, 

 being perforated in its course by the last-named slip as well as by 

 the tendon of the flexor longus digitorum to that toe. The main 

 part of the inner portion goes to the proximal and distal phalanges 

 of the great fourth toe. 



The Flexor longus digitorum {Flexor tihialis). — There is only one 

 deep flexor at the back of the leg, which comes from about a third 

 of the tibia and fibula below the popliteus. In the sole it divides 

 into three tendons, of which the innermost again subdivides for 

 the two small inner toes. There are only two Jjumbricahs. 



The Popliteus rises from the external condyle, partly from in 

 front of the groove and partly from the groove itself, which is deep 

 and narrow, and not adapted for the tendon to lie in. The muscle 

 also has an origin from the external semilunar cartilage and from 



