PROFESSOR OWEN ON THE AYE-AYE. 65 



in shape and size to the sartorius, but rather thicker and narrower : it is partly covered 

 by the sartorius as it passes to its insertion, which is by a narrow tendon, into the spine, 

 one inch below the head, of the tibia, the tendon at its insertion uniting with that of 

 the semi-tendinosus (21), which is behind it. 



The ectogluteus^ (PI. XXV. fig. 1, <) is represented by a series of conjoined 

 fasciculi having an origin extended from the anterior spine of the ilium to the sacral 

 and first two caudal vertebra?. The fibres converge and pass over the great trochanter 

 and subjacent part of the ischium to be inserted into the back and outer part of the 

 femur, from half an inch below the great trochanter to the ectocondyloid ridge. A small 

 tendon is developed from the anterior border, near its insertion, over which tendon the 

 longer posterior fleshy fibres are, as it were, twisted in descending. 



The semitendinosus {PI. XXV. figs. l,2,&3,si) has a double origin : one slender (a) from 

 the second caudal vertebra, adjoining the caudal origin of the gluteus ; the other (b) 

 thicker, in common with the long head of the ' biceps,' from the outer and back part of 

 the tuber ischii. The muscle formed by their junction is a flat band, and becomes 

 tendinous for about an inch in length, where it passes to the inner side of the tibial 

 to be inserted into the spine, along with the tendon of the gracilis (fig. 2, 21 & u). 



The ischial origin of the biceps (PI. XXV. fig. 1 , 20) is by a slender fasciculus, partly 

 tendinous, which, receiving an accession of carneous fibres from the femur, expands as 

 it descends to be inserted into the fascia (c) covering the head of the tibia and the 

 origin of the peroneus longus, and, finally {d), into the fore, upper, and outer part of the 

 tibial spine. 



The semimembranosus (PL XXV. figs. 2 & 3, 22) arises from the under and fore part of 

 the tuber ischii, beneath the common origin of the biceps and semitendinosus : it is a 

 strong, fleshy, subtrihedral muscle ; becomes flattened, contracted, and tendinous where 

 it passes over the inner head of the gastrocnemius, and then beneath the internal 

 lateral ligament (x), to be inserted into the inner and fore part of the head of the tibia. 



The adductor longus femoris (PI. XXV. fig. 2, >2') arises from the symphysis 

 pubis, adjoining the pectinseus, and beneath the origin of the gracilis, fleshy, and is 

 inserted into the inner side of the femur, from the lesser trochanter to the entocondyloid 

 ridge, being conjoined in the lower half of its insertion with the adductor magnus. 



The adductor magnus (Pi. XXV. fig. 3, ") arises from the ramus and tuber ischii, 

 and is inserted by a series of somewhat loose fasciculi into the inner side of the femur 

 from below the small trochanter to the intercondyloid space. 



' The three muscles answering to gluteus maximus, gluteus medius, and gluteus minimus, in Man, do not 

 present the proportions indicated by those names in any inferior animal. The property distinguishing them 

 throughout the mammahan series is ' relative position,' conveniently mdicated by the terms proposed in a 

 former memoir, ut supra, p. 15. 



Ectogluteus, syn. gluteus maximus. 



Mesogluteus, syn. gluteus medius. 



Entogluteus, syn. gluteus minimus. 

 VOh. V. — PART II. * 



