The Gluteal and Femoral Muscles in a Marmoset. 173 



in the lemuroid described by Murie and Mivart it is a part of 

 the medius. 



In many cases, e.g., the Midas rosalia and the Anthropoids, 

 the medius is the laro-est of the three olutei. 



Gluteus minimus (endo-gluteus) was of considerable size, 

 and was partially subdivided into four pieces, of which the 

 largest and most anterior was probably a gluteus quartus or 

 scansorius. This piece arose from the anterior half of the 

 upper part of the dorsum ilii. The next piece arose from 

 the posterior part of dorsum ilii, just above the reflected 

 head of the rectus femoris. The third piece arose from the 

 lower part of the broad posterior border of the ilium. The 

 last and lowest piece arose from the dorsum acetabuli, 

 opposite the root of the rudimentary ischial spine. The 

 field of origin was therefore a broad zig-zag line. From 

 above downwards each piece was shorter than its pre- 

 decessor, and the direction of the fibres gradually changed 

 from a vertical course, in the case of the first piece, to a 

 transverse course in the case of the lowest piece, which lay 

 side by side with the gemellus superior. 



The three lower pieces blended together, and were inserted 

 into the anterior surface of the great trochanter. The lowest 

 two pieces lay under cover of the pyriformis, and the second 

 piece lay under cover of the first (scansorius). 



The highest piece (scansorius), although blended somewhat 

 with the rest of gluteus minimus, was more independent 

 than any of the lower three parts, for it was relatively 

 distinct as far as its insertion, whereas the other three were 

 completely joined before insertion. It alone of the four 

 parts developed a tendon, which was inserted into the outer 

 surface of the great trochanter, having passed superficially to 

 the insertion of the others. The passage of the nerve to the 

 lower part of tensor fasciae femoris, between this part of the 

 muscle and the other parts, further signalised the separation. 

 It lay upon and hid from view the second piece of gluteus 

 minimus, while itself all but its anterior edge lay under 

 cover of the gluteus medius. The origin of sartorius covered 

 the upper part of its anterior edge. 



Each of the four pieces of gluteus minimus was supplied 



