ANATOMY OF THE LEMUROIDEA. 25 
In Galago crassicaudatus (Pl. IV. fig. 11, R.p.ma.) an additional outer portion is 
manifest ; this is noted in the same figure by an asterisk (*). 
In Zarsius it is similar (Burmeister, tab. 4. fig. 4,7) in condition to that of Lemur; 
also in Cheiromys. 
RECTUS CAPITIS POSTICUS MINOR.—This extends from the anterior border of the atlas to 
the occiput, and is situated more in the middle line than the preceding. 
This is said to be represented in Z. catta, in Cuvier’s 71st plate, fig. 3,M*; but the 
small portion of shading which that latter refers to is very indefinite, and not in the true 
situation of this muscle. 
Depicted in the thick-tailed Galago, Pl. IV. fig. 11, R.p.mi. 
In Tarsius it is similar (Burmeister, tab. 4. fig. 8, #); also in Cheiromys. 
The REcTUS LATERALIS is rather posterior in position, and resembles a deeper obliquus 
superior. It springs from the anterior surface of the transverse processes of the atlas, 
within its outer end, and is inserted into the cranium immediately beneath the outer 
end of the insertion of the obliquus superior. 
It is clearly represented in L. catta by Cuvier, pl. 71. fig. 3, M*. 
In Zarsius it is not mentioned. That of Galago is represented in Pls. IV. and V. 
figs. 11 & 16, £1. 
OBLIQUUS SUPERIOR.—This arises from the end of the transverse processes of the atlas, 
and passes inwards and forwards to the occiput, covering the insertion of the rectus 
capitis anticus major. Well shown by Cuvier in Z. catta, pl. 71. fig. 3, N. 
Figured by us in Galago crassicaudatus, Pl. IV. fig. 11, 0. s. 
In Zarsius' it is similar ; also in Chetromys. 
The OBLIQUUS INFERIOR is the largest of these small muscles of the head and neck. It 
has origin from the spine of the axis, and is inserted into the transverse process of the 
atlas. Also well shown in pl. 71. fig. 3, N’, of Cuvier. 
Figured in Galago crassicaudatus (Pl. IV. fig. 11, 0.7). In Zarsius? it is similar. 
2. Muscles of the Pectoral Limb. 
a. Thoracic Region (anterior and lateral). 
PrcroRAL MuscLES.—As described by Meckel*, these do not completely agree with 
the conditions exhibited in Zemur catta. 
In the latter the Prcroratis major is very much extended antero-posteriorly, and 
consists of three more or less distinct portions. See Pl. IV. fig. 12, P.ma’, P.ma’, P.ma’. 
The most anterior or clavicular portion (which is the smallest, P.ma') arises from the 
sterno-clavicular articulation, and from the innermost fourth of the clavicle; it is inserted 
into the ulnar side of the deltoid ridge. It is closely connected, except at its origin and 
insertion, with the second portion of the pectoralis major on one side, and dips a little 
beneath the deltoid on the other, especially towards its insertion. 
1 Loe. cit. tab. 4, fig. 4,9. 2 Loc. cit. tab. 4. fig. 4, h. % Loc. cit. p. 276. 
VOL. VII.—PART I. E 
