86 ORIGINAL AETICLES. 



continuous with the fascia of the leg, three inches below the head of 

 the tibia. 



In the Chimpanzee, Trolik states that the tendon is partly in- 

 serted into the inner tuberosity of the tibia. 



In the Magot these muscles were very large, especially the Gra- 

 cilis, which covered a space of If inches on the pubes. They were 

 implanted, together with the Sartorius, one inch below the head of the 

 tibia, and not one below the other, neither did they send any fibres 

 to the fascia of the leg. 



The Semimemhranosus took its origin by fleshy fibres alongside of 

 the Semitendinosus, and remained fleshy throughout ; it was inserted 

 as in man. This muscle was very large in the Magot, and was in- 

 serted by a small and strong tendon an inch and a half in length 

 into the head of the tibia. 



The Biceps Femoris difiiered widely from the corresponding muscle 

 in man. It consisted of two distinct muscles ; the superior, or ischi- 

 atic portion arose fi'om the tuberosity of the ischium, and passed 

 down the outside of the thigh, to be inserted into the heads of the 

 fibula and tibia. This portion gave off" a strong muscular slip which 

 was inserted into the lower third of the external surface of the 

 femvir. This slip is not mentioned by Professor Owen, neither does 

 it occur in the Chimpanzee. 



The second, or femoral, portion arose from the outer surface of the 

 femur, extending from two and a quarter inches below the gi-eat tro- 

 chanter to within the same distance of the external condyle of the 

 femur, and formed the lower portion of the outer hamstring. Before 

 its insertion into the fibula and anterior fascia of the leg, it gave oft' 

 a slip which was inserted irato the posterior fascia of the leg. In the 

 Grorilla, the two heads of the Biceps are distinct, but very similar in 

 disposition to those of man (Duvernoy, 1. c.) . In the Ateles, the Biceps 

 is figured by Cuvier, PL 59, as resembling man's. In the Cebus, the 

 femoral portion was entirely wanting ; the isehiatic portion was very 

 strong, and gave oft' a slip to the femur, as in the Orang ; a small, 

 but strong, tendinous baud went to the head of the fibula, while the 

 rest of the muscle became continuous with the fascia of the leg. In 

 the Cebus also, I found, beneath the Ghifaus Maximus, a thin tendon, 

 which arose from the fiiscia surrovmdiug the root of the tail, and be- 

 came a thin muscular band as it descended along the inner surface of 

 the biceps, and was inserted into the external fiiscia of the posterior 

 part of the leg, much in the same manner as the slip given off" from 

 the short head in the Orang. 



In the Magot, the Biceps was single, and wanted the slip going 

 to the f(>mur ; it was remarkably broad and thick, having a uniform 

 breadth of two inches ; and was inserted partly into the head of the 

 fibvila, but chiefly into the fascia of the leg. 



The short head of the Biceps is often wanting in man,* in which 



* Eiicyd. Aiiat. Tom. iii. ^. 305. 



