186 Proceedings of the Royal Physical Society. 



Both parts of the muscle, a and b, were supplied from the 

 posterior division of the obturator nerve. There was one 

 branch to part (b), and more than one to (a); (a) was also 

 supplied by the anterior division of the obturator. 



In the lemur (2) the adductor magnus appears to cor- 

 respond to part {a) {i.e., adductor magnus proper). Its origin 

 is from the margin of the descending ramus of the pubis. 

 The insertion is rather more than the middle third of the 

 femur. In Hapale penicillata (9) there seems to be even less 

 subdivision than in man. In Windle's specimens of the 

 Hapalidae, subdivision was evidently not conspicuous. In 

 Cynocephalus anubis (7) there is fasciculation of the muscle, 

 but no definite subdivision. In Pithecia hirsuta (9), the 

 arrangement of the adductors was as in man. In Macacus 

 cynomolgus, Cercopithecics sabaeus, Cynocephalus maimon, 

 Hylobates leicciscus, and in Troglodytes niger, the adductor 

 group, including pectineus, consists of five parts. Between 

 the lowest two the femoral artery passes. These five parts, 

 probably, are from above downwards, the pectineus, adduc- 

 tors longus and brevis, adductor magnus proper, and pre- 

 semi-membranosus. 



In the chimpanzee a part of the ischial origin can be 

 separated (8) and is supplied by the great sciatic, and is 

 clearly the presemi-membranosus. In the chimpanzee some 

 of the lower fibres spread out on the popliteal surface of the 

 femur as low down as the posterior ligament of the joint (8). 

 To a less extent this is the case also in the orang. Those 

 fibres correspond to part (b) (adductor magnus posticus). 



IV. The Muscles on the Feont of the Thigh. 



Tensor fasciae femoris consisted of two separate muscles, 

 a superior and an inferior. The superior was a very thin 

 delicate muscle, taking origin from the anterior border of 

 the ilium just below the anterior superior iliac spine, and 

 from the fascia covering the gluteus medius, and that carried 

 its attachment backwards along the short iliac crest to the 

 posterior superior iliac spine. It was inserted into the 

 anterior edge of the slightly thickened portion of the fascia 

 lata on the outer side of the thigh, at about the junction of the 



