ANIMAL MECHANICS. 



133 



examined the flexor tendons of the hand, is the Porcupine, 

 which gave me the following results : — 



Porcupine {deep flexors of fingers). 

 Flexor dig. prof., . . . 100 



1. Second finger, . 



2. Third finger, . 



3. Fourth finger, . 



4. Fifth finger, 



5. Deficiency, . . 



Total, 



• . 7.7 per cent. 



. . 7- 6 

 . . 7.1 „ 

 . . 6.6 „ 



. . 71.0 „ 



. 100.0 



In the Porcupine, no slip from the deep flexor tendon is 

 given off to the thumb, and there is no fl. poll. long, muscle. 

 It will be remembered (p. no), that the foot of the porcupine 

 resembles a hand, in having the cross section of the flexor 

 tendons greater above the heel than the cross sections of the 

 tendons of the toes ; and it is remarkable, that in the hand of 

 the same animal, the difference between the similar tendons 

 is greater (71 per cent.) than in any other hand examined by 

 me. 



(/). The Marsupials. — In the hand of the Wallaby Kan- 

 garoo, I found the following cross sections : — 



Five fingers, 100 



1. Flexor dig. prof., , . . 98.3 per cent. 



2. Friction, Sfc , . . . . 1.7 



Total, . . . 100.0 



