66 MESSRS. MURIE AND MIVART ON THE 
part of the muscle and the psoas magnus. The second division of the iliacus in 
G. allenii has a similar but rather higher origin, to the anterior superior spinous 
process. It lies outside the last and is the more laterally compressed of the two. Its 
insertion into the trochanter is by a strong, broad tendon, the three tendons of the 
psoas muscles and the iliacus being close together. 
The subvertebral muscles, psoas, iliacus, &c., in Loris gracilis answer exactly the 
condition described by Meckel (J. c. p. 374), viz.:—there is an inner tendinous psoas 
parvus attaching itself interiorly (posteriorly) to the front of the lowest lumbar ver- 
tebra, but no insertion into the ilium or pubes: secondly, there is a normal psoas and 
iliacus; and the fourth muscle of Meckel (query, our external iliacus?) arises nearly as 
high as the dorsal vertebra, and, quite separate below, ends in a strong, round tendon 
inserted into the tibial trochanter. 
In Nycticebus tardigradus' there appears to be but one large muscular mass repre- 
senting the iliacus. It arises from the sides of the bodies of the lumbar vertebre below 
the third, and from the front of the sacrum, but it has no origin from the ilium. 
Van Campen has remarked nothing peculiar in this muscle in Perodicticus*, nor has 
Burmeister in Tarsius*. 
In Cheiromys it is as in L. catta; our specimen agrees with Owen’s description. 
Psoas MAGNUS.—Arises from the bodies and transverse processes of the last three 
lumbar vertebre, and joining the iliacus it is inserted along with it, by a common 
tendon, into the tibial trochanter. 
In L. varius, L. xanthomystax, and L. nigrifrons, however, it can only be separated 
with difficulty from what seems in these animals a single iliacus. 
In Galago crassicaudatus (Pl. V. figs. 19 & 20, Ps.m) and in G. allenii it is like 
L. catta; but in G. garnettii we especially noted that it also arose very broadly from the 
inner surface of the ilium. 
In Nycticebus’, as already hinted at, it arises from the last two dorsal and six upper 
lumbar vertebre. 
In Zarsius* this muscle is said to be double, and arises as high as the last dorsal. 
Psoas PARVUS.—This is a very large muscle, about as large as the psoas magnus. It 
arises from the bodies of the last dorsal and first three lumbar vertebra, and ends in a 
very strong and expanded tendon, which, as it were, binds down the psoas magnus, and 
is inserted into the iliopectineal eminence. 
In L. xanthomystaw it arises from the second, third, and fourth lumbar vertebra, and 
is equally as strong as in L. catta, ending in a similar tendinous insertion. 
In Galago crassicaudatus (Pl. V. figs. 19 & 20, Psp) the muscle is long but not 
nearly so large as the psoas magnus. It has a fleshy origin from the fronts of 
the bodies of the third, fourth, and fifth lumbar, but not from the dorsal vertebre. 
1 P.Z.8. 1865, p. 248. 2 Loe. cit. p. 140. * Op. cit. p. 67, tab. 4. fig. 5. no. 3. 
* Loc, cit. p. 67, tab. 4. fig. 2,2 & 2a, 
