ANATOMY OF THE LEMUROIDEA, 111 
Fig. 21, Posterior view of buttocks and ischio-femoral region of left side. This figure is 
from the same specimen as fig. 20, only seen behind, with the sacrum and 
left moiety of pelvis bent forwards at a right angle, and consequently hidden 
from view. 
Ad.m. Adductor magnus, 0b.i. Obturator internus; cut tendon of 
Ad.b. e breyis. insertion. 
Ob.e. Obturator externus, G.md. Gluteus medius (insertion). 
G.m2?. Gluteus maximus; insertion of Py. Pyriformis (insertion). 
second portion. G.i. Gemellus inferior. 
Q.f. Quadratus femoris; muscular por- | S.t. Semitendinosus (origin), 
tion and insertion, thrown outwards, S.mb. Semimembranosus (origin). 
Q.f*. Quadratus femoris; tendon of origin. Gr. Gracilis (origin). 
Tro. Peroneal trochanter. 
Fig. 22. Segments (femur, tibia, and fibula) of left lower limb, a front outer view 
showing the rotator fibule muscle and its relation to the origins of the leg- 
extensors, 
R.fb. Rotator fibule, Q.er. Quadriceps extensor (the letter P. 
E.l.d. Extensor longus digitorum. indicates the patella). 
T.a. Tibialis anticus. Ga, Gastrocnemius (origin). 
E.p.h. Extensor proprius hallucis. Bf. Biceps femoris (insertion). 
I.h, Conjoined insertion of the inner ham- So. Soleus (origin). 
string-muscles, thrown forwards. Pi, Plantaris (origin). 
| P.b. Peroneus brevis. 
Fig. 23. Same parts, seen from behind, some of the muscular origins being cut away. 
The posterior and crucial ligaments of knee-joint remain. 
Po. Popliteus muscle severed, and the origin and insertion respectively thrown out- 
wards and inwards. 
R,fb. Rotator fibule ; its fibres differing in direction from those of the popliteus, which 
lies completely above. 
Fl.d. Flexor longus digitorum. T.p. Tibialis posticus. 
F.l.h. Flexor longus hallucis. 
Fig. 24. Flexors of the lower leg and sole of foot. The superficial muscles of the calf 
have been removed, and those underneath pulled out on each side. ‘The 
plantar tendons have in a similar manner been thrust out of position, to 
enable the eye to follow the course of each. 
