282 



and flexor digitorum to the 2nd, 5th, and half the hallux ; and 

 they all anastomose together in the sole of the foot, where they 

 are joined by the accessorius. 



In the Cercopithecus fuliginosus (Cuvier), or Sooty Mangaby, 

 with white eyelid, the flexor digitorum supplies the tendons 

 of the 2nd and 5th toes, and one-third of the tendon of the 

 hallux; the flexor hallucis supplies the tendons of the 3rd and 

 4th toes, and two-thirds of the tendon of the hallux ; and 

 there is no accessorius muscle. 



In the Hapale, the flexor hallucis supplies the 3rd and 4th toes 

 only, so that its human name becomes inappropriate ; and the 

 flexor digitorum supplies the 2nd and 5th toes, with a small slip 

 to the hallux. 



In the Lagothrix the accessorius muscle is wanting, and the flexor 

 hallucis is distributed to the 2nd, 3rd, and 4th toes, and partly 

 to the hallux, while the flexor digitorum supplies the 4th and 5th 

 toes, and partly the hallux. 



In the Chimpanzee, the flexor hallucis supplies the whole tendon of 

 the hallux (to which one-third of its force is sent), one-third of 

 the tendon of the 2nd toe, two-thirds of that of the 3rd toe, and 

 the whole of the 4th toe ; while the flexor digitorum supplies 

 two-thirds of the tendon of the 2nd toe, one-third of that of the 

 3rd toe, and the whole of the 5th. There is no accessorius. 



In Man, the flexor hallucis supplies the whole tendon of the hallux, 

 and half that of the 2nd toe (two-thirds of its force going to 

 the hallux, and one-third to the 2nd toe) ; and the flexor digi- 

 torum supplies the remaining half of the tendon of the 2nd toe, 

 and the whole tendons of the 3rd, 4th, and 5th toes; and the 

 accessorius combines the two tendons together in the sole of the 

 foot, pulling on both. 



The different mechanical uses of the foot, indicated by these various 

 arrangements, would form a most interesting study for an ana- 

 tomist, who might have the opportunity of observing the ani- 

 mals during life, with their varied habits of grasping, climbing, 

 and walking. 



28. M. peronceus longus, 0*32 oz. 



29. M. peronceus brevis, 0*24 oz. 



30. M. tibialis anticus, 0 79 oz. 



This muscle is composed of two distinct portions, inserted re- 

 spectively into the cuneiform bone and into the metatarsal of 

 the hallux. 



Cuneiform portion, 

 Metatarsal portion, 



0-56 oz. 

 0-23 oz. 

 0*27 oz. 

 0-12 oz. 

 0-10 oz. 

 0-08 oz. 



31. M. extensor digitorum communis, 



32. M. extensor proprius hallucis, . , 



33. M. extensor digitorum brevis, 



34. MM. abductor et opponens hallucis, 



