ANATOMY OF THE LEMUROIDEA. 63 
dissections of Galago crassicaudatus (P1. II. fig. 3, Pl. V. fig. 21, and Pl. VI. fig. 25, 
Gana’, G.ma*, Gna", and G.ma*’). 
In Nycticebus the aponeurotic interval is slight; and there is no origin from the tail. 
In the Potto, according to Van Campen’, it is partly inserted into the great trochanter. 
In Tursius? this muscle is very similar to its homologue in L. catta; but its caudal 
portion, as in Galago, is more distinct, and is described by Burmeister as the pyriformis. 
The same in Cheiromys as in L. catta, except that it arises from the first two caudal 
vertebrae, and has no aponeurotic interval. 
Guurevs mepius’, or Mesogluteus of Owen.—This is very thick and fleshy, and arises 
from the whole outer surface of the ilium and from the aponeurosis separating the 
levator caude externus and the intertransversarii ‘caude from the ischiococcygeus and 
pyriformis. It is inserted into the outer side of the peroneal trochanter, near its pos- 
terior margin, anterior to and below the insertion of the pyriformis, with which muscle 
the posterior portion of the gluteus medius is closely united. 
In some specimens of Lemur examined by us the inferior portion (anterior of Man) 
was more or less separable, so much so as to suggest the possibility of its being a scan- 
sorius. Such a separate part appears to exist in Zarszus, and is described by Burmeister 
(p. 69, and tab. 4. fig. 5. no. 6) as a part of the gluteus minimus. 
The gluteus medius of Galago crassicaudatus is depicted in Pl. VI. fig. 25, G. md. 
The Giurevs Minmus, or Ento-gluteus of Owen, is much smaller than the other 
glutei‘, and arises from the posterior and lower part of the outer surface of the ilium. 
It is inserted by a narrow tendon into a projecting tubercle in the middle of the sharp 
anterior margin of the peroneal trochanter. 
This muscle in LZ. nigrifrons arose from the whole inferior (anterior) border of the 
ilium. 
In Galago crassicaudatus and in G. allenii it is quite distinct from the gluteus medius, 
but very small and short, arising only round the upper part of the acetabulum. It 
rather corresponds with the gemelli in appearance than with the ordinary glutei (Pl. VI. 
fig. 25, G. mi). 
In Perodicticus Van Campen® says that the gluteus tertius is inserted into the 
trochanteric fossa. 
In Tarsius it appears to be as in L. catta; but Burmeister® describes as a part of it 
what in our Lemuroids forms a part of the gluteus medius. 
It is the same in Cheiromys’ as in Lemur catta. 
The ScANsorius does not exist as a distinct muscle in any of the Lemuroidea. 
Pyrirormis.—A large muscle * which, at its anterior border, is closely connected with 
1 Loe. cit. p. 39. 2 Loc. cit. pp. 68, 69, tab. 3. fig. 1. 4, 4a, & 7. 
3 Figured by Cuvier in Z. varius, pl. 70. fig. 2, a1, and by Owen, loc. cit. p. 66, pl. xxv. fig. 3, no. 51. 
4 Indicated by Cuvier in Z. varius, pl. 70. fig. 2, a*. * Loe. cit. p. 39. 
6 Loc. cit. p. 69, tab. 4. fig. 6. no. 6. 7 See Owen, l.c. p. 66. 8 Figured by Cuvier, pl. 70. fig. 2, f. 
