ANATOMY OF THE LEMUROIDEA. 13 
Professor Owen found in Cheiromys a condition similar to that which we noticed in 
our Galago crassicaudatus; for he says' “ the tensor vagine femoris is represented by a 
small fasciculus from the anterior superior spine of the ilium, which extends into the 
fascia covering the fore and outer part of the thigh.” In our specimen, however, we 
find no trace of such a structure. 
The Bicurs remoris* arises by a long and very strong tendon from the outermost and 
most posterior part of the tuberosity of the ischium. The tendon is continued in the 
substance of the muscle, and on its inner surface, for more than half its length. ‘The 
fibres spring from this tendon in a penniform manner, but very many more taking 
origin from its outer than its inner side. Those fibres which spring from the posterior 
part of the outer side of the tendon are inserted into the aponeurosis connecting this 
muscle with the vastus externus. All the other fibres radiate and are lost in the fascia 
investing the outer side of the leg. 
In L. varius the tendon is only for nearly half the length of the muscle, and hardly 
quite so far in L. nigrifrons. 
The biceps in Galago is simpler than in Lemur. It has a long, strong tendon of 
origin from the tuberosity of the ischium, and a very moderately thick belly, ending in 
an equally very strong, but flattened, tendon, which is inserted into the outer tuberosity 
of the tibia. See G. crassicaudatus, Pl. Il. fig. 3, Bf, and Pl. V. fig. 25, Bf. 
Kingma® says it is single in G. peli. 
Loris gracilis, while resembling our type, has this muscle, the semimembranosus, and 
the semitendinosus remarkably connected at their origins. 
In Nycticebus* it is as in Lemur catta, but it is inserted only outside the lower leg. 
Burmeister figures it in Tarsius §. 
Chetromys in the main agrees with L. catta; Owen’s® partly muscular origin is only 
the origin in common of this muscle and the semitendinosus. His origin from the 
femur is only its adhesion to the vastus externus. 
SEMIMEMBRANOSUS’.—This muscle is round and fleshy at its middle, flat and tendinous 
at its origin, and very narrow and entirely tendinous at its insertion. It arises from the 
tuberosity of the ischium, beneath the biceps, but not extending so far backwards, also 
from the so-called ascending ramus of the ischium at its posterior margin. It is inserted 
by a strong, round tendon, which passes beneath the internal lateral ligament into the 
head of the tibia. 
In L. varius, figured by Cuvier, ‘Myology,’ pl. 70. figs. 2 & 3, s, and in Loris, pl. 67. 
fig. 2, s. 
' Loe. cit. p. 64, pls. xxiv. & xxv. figs. 1-3. 
* Figured in Lemur varius by Cuvier, pl. 70. figs. 1, 2, & 3, ¢, and in Loris gracilis, pl. 67. figs. 1 & 2, q. 
% Observationes de Otolicno peli, p. 30. 4 P. Z.8. 1865, p. 249. 
5 P. 74, tab. 3. fig. 1. no. 20. ® Loe. cit. p. 65, pl. xxv. fig. 1. 20. 
7 Nyeticebus tardigradus, P. Z. 8. 1865, p. 249; Tarsius, p. 74, tab. 3. fig. 1. no.22; Cheiromys, p. 65, 
pl. xxv. figs. 2 & 3. nos. 20 & 22. 
VOL. VII.—PART 1. L 
