DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 563 
the fourth and fifth digits, where it expands, and is partly attached by fascia to the 
proximal end of the fifth metacarpal; but the tendon proper runs along the outer side 
of the fourth digit in manner similar to the inner tendon of the second or middle 
portion of the common muscle; namely, it is inserted into the proximal and outer end 
of the second phalanx. 
A muscle which seldom alters or varies in its attachments, the extensor carpi ulnaris 
(£.c.u), is here also, speaking in a general way, normal. It arises as a broad muscular 
layer from the olecranon process, above the last-mentioned two muscles, and ends in 
a long narrow tendon inserted into the outer edge and near the middle of the fifth 
metatarsal bone. 
Long Superficial Palmar Muscles.—If my interpretation be correct, the palmaris 
longus in this species of Ofaria is represented by three unequal-sized and differently 
shaped muscles, which I shall describe as follows :— 
a. Palmaris longus primus (P./'). What may be considered the proper and usual 
long palmar muscle, inasmuch as it lies immediately to the ulnar side of the flexor 
carpi radialis, is of moderate size in belly and narrow and diminutive in tendon. It 
arises, partly muscular and partly tendinous, from the inner condyle of the humerus, 
from the surface of the internal anconeus, and with interlacing musculo-fleshy fibres 
from the radial side of the second long palmar muscle. With a somewhat fusiform 
belly it proceeds about halfway down the forearm, where it forms a narrow tendon, 
which is at last implanted and lost on the under surface of the great oblique palmar 
tendon mentioned further on. 
6. Palmaris longus secundus. This portion is thin and much broader than the pre- 
ceding. It has origin along with it from the internal condyle, but also as an extensive 
sheet from the surface of the palmaris next to be described, and partly from the edge 
of the dorsi epitrochlearis and the ulnar side of the terminal muscular arch of the pec- 
toralis major. The muscular fibres stretch ulnarwise for nearly half the breadth and 
length of the forearm, mingle with the superficial aponeurosis of the forearm, coex- 
tensive with the pectoralis major, and go to be inserted on the superficies of the ulnar 
side of the palm; a special broad and strong slip, moreover, passes to the distal end of 
the fifth metacarpal. 
c. Palmaris longus tertius. I venture to designate by this name a muscle which, 
as far as origin, size, and fleshy union are concerned, might with equal grounds be con- 
sidered an upper layer of the flexor carpi ulnaris. But as its insertion is so widely 
different from that of the ulnaris, and moreover its terminal ligamentous expansion so 
resembles in function that of the usual palmar fascia, I think it ought to be classed 
under the occasionally multiple long palmar muscles, with the additional affix tertius. 
This muscle is remarkable alike for its strength, anomalous position, and for the 
influential purpose it subserves in nearly all the movements of the manus. It arises by 
a moderate amount of fibre from the internal condyloid prominence, and by a broad, 
