ANATOMY OF THE LEMUROIDEA. 35 
a. Brachial Region (Extensors). 
Supinator Loncus.—Has origin from the external condyloid ridge of the humerus ; 
and its flat tendon is inserted into the radial border of the radius, rather more than half 
an inch above its lower end, and immediately below the lower end of the long insertion 
of the pronator teres. 
This muscle in Z. varius’ is inserted into the styloid process. 
In L. xanthomystax it is similar, the lowest portion being weak and closely applied 
to the radius. It seems also to pass to the pisiform bone and deep palmar fascia. We 
could only follow its unusually thin tendon in ZL. nigrifrons as far as the styloid 
process. 
Figured in Galago crassicaudatus (Pl. II. fig. 3, and Pl. IV. figs. 13 & 14, S./), where, 
as in G. allenii, it arises as high almost as the middle of the shaft of the humerus, and 
occupies the third fourth of that bone. Its tendon is inserted into the styloid process. 
In 7arsius? it is substantially the same as in L. catta. 
SUPINATOR RADII BREVIS.—This muscle arises by tendinous fibres from the external 
condyle and annular ligament, but not at all from the ulna. Winding round the shaft 
of the radius, it is inserted into the anterior surface of that bone on a line leading 
obliquely downwards and outwards, and conterminous with the upper parts of the inser- 
tions of the pronator teres and flexor longus pollicis. 
That of Galago crassicaudatus, which obtains in the other species of the genus, as also 
in WVycticebus, is shown in Pl. IV. fig. 13, 8.7.0. 
In Tarsius* it is substantially as in L. catta. 
It is not mentioned by Owen in his description of Cheiromys; but we find it in that 
genus to be quite similarly conditioned to that of L. catta. 
The EXTENSOR CARPI RADIALIS LONGIOR arises below the supinator longus from the ridge 
leading from the external condyle. It terminates in a flat tendon which is very closely 
applied to that of the extensor carpi radialis brevior, and passes beneath that of the 
extensor ossis metacarpi pollicis, and then beneath that of the extensor secundi inter- 
nodii pollicis. It is inserted into the radial side of the base of the second metacarpal. 
In L. varius this and the following muscle are figured by Cuvier, pl. 69. fig. 1,6 & 3'; 
and in Loris gracilis, pl. 67. fig. 1,8 & 8. 
That of Galago crassicaudatus is shown in Pl. II. fig. 3, and Pl. IV. figs. 13 & 14, 
Een. 
EXTENSOR CARPI RADIALIS BREVIOR.—A little smaller than the extensor carpi radialis 
longior. It arises from the external condyle; and its fibres terminate above the middle 
of the forearm in a flat tendon, which passes down like that of the last-named muscle, 
and is inserted into the outer border of the bone of the middle metacarpal. 
Figured in Galago crassicaudatus (PI. II. fig. 3, and Pl. IV. fig. 13, E.c.r.0). 
1 Tt is figured by Cuvier, pl. 69. fig. 1,v; and in Loris gracilis, pl. 67. fig. 1, v. 
* Loe. cit. p. 55, tab. 5. fig. 3. 23, and tab. 3. fig. 1. 23. 3 Loe. cit. p. 56, tab. 3. fig. 4. 36. 
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