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' (Pl. XXV. fig. 1, 4) 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 vertebre. 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. Asmall 
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 (Pl. XXV. figs. 1,2, & 3,2) has a double origin : one slender (a) from 
the second caudal vertebra, adjoining the caudal origin of the gluteus; the other (0) 
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 & 14), 
The ischial origin of the biceps (Pl. XXV. fig. 1, 2°) 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 (ec) 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, ») 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 (7), to be inserted into the inner and fore part of the head of the tibia. 
The adductor longus femoris (Pl. XXV. fig. 2, ») arises from the symphysis 
pubis, adjoining the pectineus, 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 (Pl. XXV. fig. 3, 2) 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 mawimus, 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 mammalian series is ‘relative position,’ conveniently indicated by the terms proposed in a 
former memoir, u¢ supra, p. 15. 
Ectogluteus, syn. gluteus maximus, 
Mesogluteus, syn. gluteus medius. 
Entogluteus, syn. gluteus minimus. 
VOL. V.—PART II. K 
