1865.] MYOLOGY OF HYRAX CAPENSIS. 341 
The extensor minimi digiti arises as usual (Fig. 5, #.m. d.), but 
soon divides into two separate delicate muscles, each of which ends 
in a tendon, one being inserted into the proximal phalanx of the 
fifth digit ; the other, passing beneath the outermost tendon of the 
extensor communis digitorum, goes to the distal end of the fourth 
metacarpal bone. Meckel found only a single tendon, which went 
to the fifth digit *. 
The extensor ossis metacarpi pollicis is a well-developed muscle, 
with rather an extensive origin, and with much tendon in its sub- 
stance. It is inserted into the trapezium and rudiments of the pollex. 
The extensor primi, the secundi internodit, and the extensor indicis 
are all wanting. 
The extensor carpi ulnaris has origin from the outer side of the 
coronoid process of the ulna and the outer condyle of humerus, but 
chiefly from the latter. Its insertion is into the proximal end of the 
fifth metacarpal and the pisiform bone. 
The pronator teres arises from the internal condyle, as usual. The 
insertion is by a flattened and pretty strong tendon into the middle 
of the shaft of the humerus, at its inner side. 
The flexor carpi radialis arises from the inner condyle, below the 
last. This muscle, which is tendinous at its lower half, is inserted 
into the trapezium. 
The palmaris longus is rather largely developed, and arises from 
the inner condyle and intermuscular fascia. Passing down to the 
palm of the fore limb, it forms the palmar fascia, which contains a 
flat fibro-cartilaginous disk, the palmar fascia ending in four slips 
for the four digits. At the carpus, a bursa is interposed between the 
tendon of this muscle and that of the flexor carpi ulnaris. Meckel+ 
says that this muscle is only represented by a long, wide tendon ; 
but in our specimen it had a good fleshy belly. 
The flexor carpi ulnaris is a very strong muscle, with the usual 
origin, and inserted into the pisiform bone by a very broad tendon, 
the muscular fibres on the outer side reaching down to that bone 
(fig. 6, 7. c.u.). 
The flexor sublimis digitorum arises in intimate union with the 
deep flexor as far nearly as the carpus, but is divisible into three slips, 
each of which gives off a tendon, these three tendons going to the 
second, the third, and the fourth digits; that into the second is in- 
serted in the inner side of the tendon of the deep flexor; that to the 
third forms its perforated tendon; that to the fourth unites with a 
tendon of the next muscle to form the perforated tendon of that digit. 
Meckel’s description does not at all agree with our description 
(fig. 6, F. s.d.). 
Flexor brevis manus.—This very peculiar and, as far as we know, 
hitherto undescribed muscle arises from the fibro-cartilaginous 
disk above mentioned, and from both the superficial and the deep 
palmar fasciee. It divides into three distinct and rather long digi- 
tations, each ending in a tendon. These three tendons go to the 
second, fourth, and fifth digits ; that going to the fourth digit unites 
* Loe. cit. p. 321. + Loe. cit. p. 317. 
