448 DR. J. MURIE ON THE ANATOMY OF THE WALRUS. 
Where the two tendons join (woodcut 4, /.sép) they spread out and, closely inter- 
mingled with each other, form a wide triangular aponeurotic tegumentous expanse, 
which receives in addition, on its radial side, the tendon of the flexor longus pollicis. 
This last muscle has an elongated moderate-sized belly, and arises from the shaft of 
the radius immediately below its bicipital tubercle. 
S57. 
Biesa, 
Inner aspect of the left fore limb, the superficial palmar 
fascia being raised and thrown outwards. 
S, Subscapularis. Hp.s. Epi-subscapularis. S.sp. Portion 
of supraspinatus. Z.ma. Teres major. O.h. Cephalo- 
humeral, cut through near insertion. Za.ddP.c. Com- 
bined insertion of latissimus dorsi and panniculus car- 
nosus. P.mi, A similar segment of pectoralis minor, 
like last, dragged out. B. Biceps. (.b. Coraco-bra- 
chialis. B.a. Brachialis anticus. D.ep. Dorso-epitro- 
chlear. 7", 7°, T°. Triceps, three bellies. A.i, Anconeus 
internus. P.?& P.15. Palmaris longus secundus and 
tertius; the palmar fascia (Pf,Pf*) is retroverted on 
both sides of manus. P.r.t, Pronator radii teres. F.e.r. 
Flexor carpi radialis. Jic.u. Flexor carpi ulnaris. 
F.s§p. Flexor sublimis digitorum and Flexor pro- 
fundus digitorum. /.J.p. Flexor longus pollicis. F.b.m. 
Flexor brevis manus. JZ. Lumbricalis. 
IV. Digits. B.px a. Brachial plexus and arteries. 
From the palmar fascia above spoken of, five large tendons are given off, one to each 
digit. At the distal ends of the metacarpals the tendons alter in character, splitting 
into two layers, the lowermost of which forms a kind of sheath for the uppermost, or, 
in other words, represents a perforatus and perforans. 
The perforated tendons go to the proximal ends of the second phalanges; the per- 
forating, on the other hand, proceed further, and are inserted quite into the digital 
cartilages. But, besides their mesial tendon, each perforating tendon of the second, 
third, fourth, and fifth digits has, about the middle of the second phalanx, three 
