ANIMAL MECHANICS. 



Ill 



"Weight. 



Flexor hall, long , . . 81 6 per cent. . 0.32 oz. av. 

 Flexor dig. long., . . 18.4 „ .0.10 „ 



100.0 



(k.) The Marsupials. The Kangaroos and Phalangers may 

 be selected as good specimens of Marsupials. In the Kanga- 

 roos, the plantaris muscle takes an originfrom the outer condyle 

 of the femur, and from the crescent-shaped sesa- 

 moid bone lying beneath it at the top of the 

 fibula ; it is inserted into a tendon that flows 

 freely over the calcaneum, and becomes ulti- 

 mately the perforate tendon of the toes. At the 

 outer side of the heel, a tendon (a) is given off', 

 Fig. 16, which runs direct to the outer toe, and 

 forms half of its perforate tendon, the other 

 half being formed of a slip given off by the 

 main tendon near the toes. 



Perforate flexor tendons of Wallaby Kangaroo. 

 Plantaris tendon, . . . . 100. 



1 . Perforate tendon of third toe, 7 1 per cent. 



2. ,, ,, fourth toe, 26 ,, 



3. Deficiency, 3 ,, 



Total, ... 100 



Fig. 16. 



The deep flexor tendons of the Marsupials are formed of 

 the single tendon belonging to the fl. hall. long. and./?, dig. 

 long, muscles conjoined. I have found the following results 

 to represent their relative strengths : — 



