156 PHYSIOLOGICAL SERIES. 



C. 230. Muscles of the left foot of a Baboon (Papio [ Cynocephalus] 

 babuin). The accessorius is well marked. The flexor 

 brevis digitorum has two separate points of origin : 1, 

 from the calcaneum with insertion upon 11. ; 2, by several 

 fasciculi from the conjoined deep flexor tendons, this part 

 sends tendons to digits in., IV., v. There is an independent 

 muscle-slip situated upon the plantar surface of the 

 abductor v. The tendons of the extensor brevis to I. and 

 n. rise from a single belly. 0. C. 64 M. 



C. 231. The right hind-limb of a Crested Baboon (Cynopithecus 

 niger], showing the semimembranosus and prae-semirnem- 

 branosus, the duplicity of the tibialis anticus for the 

 distal half of its course, and the independent insertion of 

 the soleus. 0. C. 64 M b e. 



C. 232. Nerves and superficial muscles of the right hind-limb 

 of a Gibbon (Hylobates leuciscus}. The muscles are of 

 slender build, with no great intrinsic strength, but, as 

 in so many other arboreal creatures, the power of the 

 flexors of the knee is largely increased by their insertion at 

 a considerable distance below the joint. The muscles of the 

 ectogluteal layer form a continuous sheet, with the exception 

 of a certain degree of individuality in the tensor fasciae 

 latse towards its insertion. The biceps has both ischial and 

 femoral heads which unite as in Man to form a single 

 tendon inserted on the fibula. The sartorius, gracilis, 

 and semitendinosus form (as in the Lemur C. 225) a 

 common tendon inserted partly on the tibia, partly con- 

 tinued downwards into the superficial fascia of the leg. 

 The sartorius in this and the other anthropomorphous apes 

 rises from the ilium considerably farther back than in Man. 

 The flexor brevis digitorum rises, as in the lower Primates 

 and Lemurs, partly from the deep flexor tendons, its cal- 

 caneal head supplies n., that from the flexor tendons in., 

 iv., and v. 0. C. 64 M I. 



C. 233. Nerves and deeper muscles of the left hind-limb of a 

 Gibbon (Hylolates leuciscus). The prae-semimembranosus 



