CHURCH OK THE MYOLOGY OF THE OEANG UTAXG. 89 



ran along the superior surface of tlie metatarsal of the little finger, 

 to be mserted with that of the Extensor Communis Digitorum. 



In the Magot the Feronceiis Tertius became tendinous very high 

 up the leg, passed down, closely applied to the posterior part of the 

 PeroncBus Brevior, accompanying the tendon of the latter muscle until 

 its insertion, and did not pass through a slit in it as in the Cebus. 



The Gastrocnemius was remarkably thin and weak, causing the 

 absence of any calf to the leg ; this muscle is stated by Duvernoy to 

 have remained distinct from the Soleus in three specimens dissected 

 by him, but in this instance the two became fused, three inches above 

 the point of insertion. 



The Soleus was intimately connected with the external head of 

 the Gastrocnemius, and arose from the head of fibula, by a very narrow 

 tendon, receiving no fibres from the tibia and not even encroaching 

 on the FopUteus or Flexor digitorum. 



In the Cebus the Soleus was much larger, but had only a single 

 origin from the head of the fibula. In the Magot both these 

 muscles were, much larger, forming qidte a calf to the leg. The 

 Soleus remained distinct for a much longer period than in the Orang, 

 and it arose by two heads, one from the fibula, the other from the 

 external condyle of the femur. 



The Plantaris was wanting ; as stated by Duvernoy and Dr. 

 Traill, it is present in the Chimpanzee and wanting in the Grorilla, 

 (Duvernoy, 1. c. p. 93). It was well developed in the Magot, arising 

 in conjunction with the external head of the Gastrocnemius ; it was 

 absent in the Cebus. This muscle appears not to be as often absent 

 as it is usually supposed, not one case being met with by Mr. Hallett. 

 The FopUteus, which was not found by Dr. Traill, was present in 

 the Orang, and also in the Cebus and Magot, being very large in 

 the latter animal. The most striking points in the muscles of the 

 posterior extremity were the weakness of the Glutcei muscles, and 

 the striking development of the Gracilis, Semi-membranosus and 

 Semi-tendinosus. The abductors were very similar to man's, but were, 

 perhaps, slightly stronger, while the Quadriceps extensor was much 

 weaker. The leg of the Orang contrasted with that of the Magot 

 most strikingly. In the latter animal the muscles of the poste- 

 rior region were developed so as to form a large and well-shaped calf, 

 while the excessive development of the Tihialis Anticus gave quite a 

 deformed appearance to the anterior region, the large development 

 of these muscles seeming to point to the terrestrial habits of this 

 animal. The Feronceus tertius was absent in the Orang, and is fre- 

 quently wanting in the human subject ; and the Feronceus Brevis 

 is subject to many variations in man, presenting abnormal conditions 

 once in every five subjects examined by Mr. Hallett. 



The Flexor Lonc/us Figitorum had not such a large origin as in 

 man, it extended dowTi the tibia to within 2\ inches of the lower end 

 of that bone, while in man it reached to within 3 inches. The mus- 

 cular fibres did not terminate in a tendon until the muycle had 



