68 MESSRS. MURIE AND MIVART ON THE 
Rectvs FEMoRIs.—This muscle arises from the prominent posterior inferior (inferior 
anterior) spinous process of the ilium by a very strong tendon, and also, as in Man’, by 
a branch of the same tendon from the anterior (superior) margin of the acetabulum. 
It is considerably overlapped by the vastus externus, and is inserted as usual into 
the patella in common with the other parts of the (here very distinct) quadriceps 
extensor. 
See Cuvier, pl. 70. figs. 1, 2, & 3, p (L. varius), and pl. 67. figs. 1 & 2, p (Loris 
gracilis. 
It has most certainly a double tendon of origin in LZ. varius, L. vanthomystax, and in 
L. nigrifrons. 
Figured in Galago crassicaudatus (Pl. II. fig. 3, Pl. V. figs. 19 & 20, and Pl. VI. 
fig. 25, R.f). It is double-headed. In Galago garnettii the united tendon extends for 
two-fifths of the whole length of the muscle. In G. allenit the muscular portion is 
as long as the lower two-thirds of the femur, which is likewise the case in the Grand 
Galago. 
There is a double tendon in Nycticebus, in Cheiromys*, and in Tarsius’. 
Vastus intERNUS‘.—In Lemur catta this is a small muscle arising from the inner sur- 
face of the femur, its origin extending beside the insertion of the psoas and iliacus. 
Cuvier figures it in L. varius (see his ‘ Recueil,’ pl. 70. fig. 3,2) and in Loris gracilis 
(1. c. pl. 67. fig. 2, n); that of Galago crassicaudatus is shown by ourselves (PI. II. 
fig. 8, and Pl. V. figs. 19 & 20, V. ¢). 
In Tarsius® this muscle is said to be divisible into two layers, the lower one of which 
seems to be an internal division of our crureus. 
Vastus EXTERNUS’.—A very long muscle indeed, and embracing the whole outer side 
of the thigh, even overlapping the rectus. It arises from the outer and anterior margin 
of the peroneal trochanter and from the outer side of the third trochanter, and it is 
inserted as usual. 
Cuvier figures it in his ‘ Recueil, pl. 70. fig. 1, m (Z. varius), and pl. 67. fig. 1, m 
(Loris gracilis). 
It is uncommonly large in Galago crassicaudatus, and, if at all, is very indistinctly 
divided. Exhibited in Pl. II. fig. 3, Pl. V. fig. 19, and Pl. VI. fig. 25, V.e. 
In Loris and Nycticebus it is very much smaller relatively than it is in the Lemwrs 
and Galagos. 
In Cheiromys it is of great size and single, as in Lemur and Galago. 
In Tarsius this muscle is not only of very large size, but separable into two distinct 
1 Henley mentions a single origin ! * Loe. cit. p. 66, pls. xxiv., xxv. figs. 1-3, no. 16. 
3 Loe. cit. p. 72, tab. 4. fig. 5. 16, and tab. 3. fig. 1. 16. 
+ Owen, Cheiromys, I. c. p. 66, pl. xxiv. and xxv. figs. 1 and 2, 18. 
5 Loc. cit. pp. 72, 73, tab. 3. fig. 1. 18, and tab. 4. fig. 5. 18 a. 
§ Trans. Zool. Soc. vol. v. p. 66, pl. xxv. figs. 1 & 3, no. 17. 
