190 Proceedings of the Royal Physical Society. 



named. In lemurs (2) the attachments and the relative 

 sizes of the two vasti are as in Ha^pale. In Galago garnetii 

 the united tendon of rectus extends for two-thirds of the 

 length of the muscle. Eectus has in some cases only one 

 head, e.g., Cynocejphalus anuhis (7), gibbon (8), Rylohates 

 cynocejphaluSy and often in the chimpanzee (17). The vasti 

 become stronger, and obtain a more extensive origin as the 

 erect attitude is approached. In Anthropoid apes (8) the 

 origin is as in man. The prolongation of the tendon of 

 rectus into the substance of the muscle, down almost to its 

 insertion, is merely an exaggeration of the condition normally 

 found in man. 



I do not find any record of the presence of a suprapatellar 

 cartilage developed in the tendon of the quadriceps in any 

 of the Primates. It was well developed in the Hapale 

 jacchus. 



Psoas magnus was relatively a small muscle. It took 

 origin by four slips from the contiguous borders of and 

 intervertebral substance between the 3rd, 4th, 6th, and 6th 

 lumbar vertebrae and the corresponding transverse processes, 

 and also from the ala of the sacrum. It passed downwards 

 by the side of the vertebral column behind psoas parvus, 

 and along the brim of the pelvis overlying the iliacus, which, 

 until their exit from the abdomen, was concealed by it. 

 Escaped from the abdomen, it passed obliquely downwards 

 to its insertion by a tendon into the small trochanter. 



It was supplied by branches from the 3rd and 4th lumbar 

 nerves, and from the anterior crural by a long branch, which 

 also supplied iliacus. 



IHacus was a small narrow muscle, and in the abdomen 

 lay under cover of psoas. It arose from the very narrow 

 abdominal surface of the ilium, which also gave origin to 

 quadratus lumborum. The main origin of iliacus was below 

 quadratus, but it sent up two pointed slips, one on each side 

 of the quadratus. The outer of these slips was the larger. 

 The inner, a very small slip, went beyond the ilium, and was 

 attached to the outer margin of the ala of the sacrum and 

 the anterior sacro-iliac ligament. Behind Poupart's ligament 

 it appeared from under cover of psoas magnus, and lay to its 



