244 MESSRS. MIVART AND MURIE ON THE {Feb. 28, 
portion, and is inserted into the inner side of the neck of the 
humerus, between the conjoined tendons of the teres minor and sub- 
scapularis and that of the teres major. It is just in front of the 
external head of the triceps, and has the tendon of the latissimus 
dorsi passing immediately before it. 
S. Van der Kolk and Vrolik say nothing of the short head. With 
reference to the action of this muscle, it is probable that, besides 
mere flexion mentioned by them, the shor¢ slip has an influence in 
the rotation of the limb. ; 
Meckel’, in contradistinction to the Loris says, in ‘les Makis”’ 
it is divided, thereby implying that in the first it is single. 
Kuhl’, as early as 1820, noticed the division of this muscle in 
Ateles. Cuvier, in his ‘ Lecons’ *, has also mentioned its bifurcation 
in Monkeys. Burdach* describes a double head in the Simiade ; 
Burmeister’ in Tarsius; and Prof. Owen* notices in Cheiromys a 
condition very similar to that existing in our Nycticebus. The 
shorter portion is apparently described by W. S. Church’ as a slip 
of the biceps. 
The Jiceps is described in the joint memoir as having two heads, 
uniting obliquely below, and having a common insertion into the 
radius. In the earlier paper on the Quadrumana, by one of the 
authors, W. Vrolik’®, it is described as consisting of but one portion 
in Stenops; but he does not mention which species he refers to. 
Meckel® likewise asserts that there is but one head in Loris. This 
last is the condition it presented in our specimen, the muscle arising 
by a long and remarkably strong tendon from the margin of the 
glenoid cavity, and with its usual insertion. In both Tarsus’ and 
Cheiromys"' there are two heads. 
The flexor sublimis digitorum is a slender and double-bellied 
muscle, there being a distinct tendon in its middle’. It arises from 
the internal condyle and intermuscular fascia, and gives from the 
distal end of the lower muscular belly a very small tendon which 
joins the flexor profundus, as noticed by S. Van der Kolk and Vrolik. 
Just below this four other tendons (of about equal size, excepting 
that to the index, which is considerably more slender) are given off 
and go to the second, third, fourth, and fifth digits respectively. 
They bifurcate, as usual, to give passage to the tendons of the flexor 
profundus, except the tendon of the index, which does not split, but 
joins the deep tendons opposite the base of the proximal phalanx of 
the index (figs. 2 & 3, F.s). 
A similar connexion exists between the superficial and deep flexors 
1 Anat. Comp. vol. vi. p. 281. 2 Kuhl, doe. cit. p. 16. 
3 Vol. i. p. 395. 4 Loe. cit. p. 25. 
5 Op. cit. p. 49, t. 3. fig. 2. nos. 14 and 14 4, 
6 Trans. Zool. Soc. vol. v. p. 60, pl. xxiii. fig. 1, nos. 14 and 14 J. 
? Nat. Hist. Review, 1861, p. 514. 
8 Todd's Cyclop. Anat. and Physiol. yol. iv. p. 218. 
* Anat. Comp. vol. vi. p. 291. 
10 Burmeister, p. 51, t. 3. figs. 1, 2. no. 2 a, d. 
™ Owen, /. c. p. 60, pls. xxii. xxiii. fig. 1. no. 20. 
2 Previously noticed by Meckel, loc. cit. p. 340. 
