172 Proceedings of the Royal Physical Society. 



In the Cynocephalus anuhis (7) the origin is limited, 

 extending not higher than the lowest part of the sacrum and 

 the root of the tail. There is no union with the tensor 

 at the origin, but they join opposite the great trochanter, 

 where some fibres are given off to be inserted into the linea 

 aspera, while the rest are inserted into the fascia lata with 

 the tensor. 



In all the four Anthropoids described by Hepburn (8) 

 there was an ischial origin. The lower part of gluteus 

 maximus took origin from the ischial tuber in close contact 

 with the biceps. This he regards as a displaced agitator 

 caudse. 



Gluteus medius (meso-gluteus) was a thicker and fleshier 

 muscle than gluteus maximus at its origin, but not so large 

 as maximus when the two parts of that muscle had joined 

 and lost their flattened character. 



It took origin from the upper and dorsal part of the narrow 

 dorsal surface of the ilium, from the upper part of the broad 

 posterior border of the ilium, from the tendon of the ilio coccy- 

 geal muscle, and from the dense fascia covering that part of 

 it which was uncovered by the gluteus maximus — i.e., the 

 antevior part. It was inserted by tendinous fibres into the 

 top of the great trochanter overlying the insertion of pyri- 

 formis and into a very small portion of the posterior surface 

 of the great trochanter. It covered the pyriformis and the 

 two upper or anterior pieces of the gluteus minimus. 



The nerve supply was through the superior gluteal, from 

 the 6th lumbar nerve only. 



The gluteus medius is fairly constant in its characters. In 

 almost all monkeys, according to Bischoff (9), it is blended 

 with the pyriformis, and that condition is described in the 

 papers quoted on lemurs (2), Gynoceyhalns anubis (7), and the 

 Anthropoid apes (8). But in the Midas roscdia (3), as in the 

 Hypale jacchus, there is no such fusion with the pyriformis. 

 In some specimens of lemurs the inferior portion — corre- 

 sponding to the anterior portion in man — is more or less 

 separable, suggesting a separate scansorius. Such a separa- 

 tion is found in tarsius, but the separate portion is described 

 by Burmeister (10) as a part of the gluteus minimus, whereas 



