The GhUcal and Femoral Muscles in a Marmoset. 183 



by Hepburn it was that part of adductor magnus which was 

 inserted into the adductor tubercle. In the Rylohates agilis 

 and syndactylus it is quite a separate muscle (Leche). 



The insertion of the tendon of semi-membranosus proper 

 into the upper part of tibia is very constant, as is also its 

 passage under cover of the internal lateral ligament of the 

 knee. An insertion into the posterior ligament of the knee, 

 or into the fascia of the leg, is only seen in Anthropoid apes. 

 Hepburn found it only in the gorilla. Its presence in my 

 Hapale was possibly anomalous. 



III. The Muscles of the Inner Side of the Thigh. 



Gracilis was relatively a very strong muscle, with a broad 

 origin from the whole length of the body of the pubis closely 

 adjoining the symphysis, and slightly from the upper end of 

 the edge of the inferior ramus of the pubis. There was no 

 origin from the ascending ramus. 



Its insertion was into the upper end of the inner surface 

 of the shaft of the tibia between the insertions of sartorius 

 and semi-tendinosus, and also — and this was the main inser- 

 tion — into the fascia of the leg below, extending as far down 

 as the middle of the leg. 



Nerve supply — a branch from the anterior division of the 

 obturator nerve. 



In almost all monkeys, including the lemurs, the gracilis 

 is relatively much more powerful than in man (1). I find 

 two exceptions recorded, one at either end of the scale. In 

 Tarsius it is the smallest of all the thigh muscles (2). In 

 the Hylohates leuciscus it is a small thin muscle. Its origin 

 in many cases encroaches upon one or both of the pubic 

 rami, and is usually inserted in association with semi- 

 tendinosus or sartorius or both. 



Pectineus took origin together with the adductor longus 

 by a thin sheet of tendinous fibres from the upper margin 

 of the pubis near the symphysis, and outwards along the 

 pectineal line for one-half its length. The outer half of this 

 tendon of origin was pectineus, the inner half was adductor 

 longus. The contiguous borders of the two muscles were 

 fused except near the insertion, but artificial separation was 

 VOL. XV, 



