498 
Proceedings 0/ the Royal Irish Academy. 
biceps ; it is double tlie biceps in weight. Tlie triceps is enormous, 
its long head arises from the whole edge of the post-scapnla, and the 
humeral head was indivisible and closely joined to the scapular. This 
muscle is four times the weight of the combined biceps and brachialis. 
There is no dorsi epitrochlearis, and the external anconeus (which 
exists) is inseparable from the triceps. 
In the forearm there is no pronator teres, nor supinator longus. 
The flexor carpi radialis extends from the inner condyle to the base 
of the first metatarsal (that of the index). The palmaris longus is 
half the size of the foregoing, and is nearly inseparable from the 
flexor carpi ulnaris. That muscle has two heads which are quite 
separate, an olecranal and a condyloid, each of which equals the 
flexor carpi radialis ; they were inserted by a common tendon into the 
pisiform bone, and the palmaris longus external thereto ended in the 
flat fascia of the palm. 
The flexor sublimis was very small, equalling the flexor carpi 
radialis, and sent perforated tendons to the 1st, 2nd, and 3rd digits. The 
flexor pollicis and digitorum both arose from the humerus and slightly 
from the forearm bones; the former was ^rd of the latter, and both com- 
bined were five times larger than the flexor carpi radialis and ^rd the 
size of the brachialis anticus. The pronator quadratus was very small, 
barely detectible, and did not occupy fth of the length of the interos- 
seous space. 
There was a single extensor carpi radialis which was inserted by 
one tendon into the second metacarpal bone; this muscle was the 
largest on the forearm, equalling all the digit flexors combined ; there 
was no supinator brevis. The extensor digitorum longus sent off three 
tendons to the 2nd, 3rd, and 4th digits ; this muscle was also 
large, being more than frds the foregoing. The extensor minimi digiti 
sent off two tendons to the first and second phalanges of the 3rd and 
4th digits ; it was exactly half the size of the common extensor. 
The extensor carpi ulnaris arose by a tendon from the external 
condyle, it wound round to the flexor side of the .forearm, and was 
inserted into the pisiform : it equalled the flexor carpi radialis in size. 
Extensor ossis metacarpi pollicis was about the same size, and arose 
mainly from the radius as well as from the interosseous space ; it is in- 
serted into a sesamoid bone at the base of the 1 st digit. There was one 
lumbricalis to the radial side of the 4th digit ; an abductor minimi 
digiti from the pisiform to the 1 st phalanx, a flexor brevis for the 
same finger from the head of the 4th metacarpal and an adductor 
from the os magnum. The dorsal interossei are, abductor indicis from 
the scaphoid and 1st metacarpal to the 1 st phalanx, abductor (radialis) 
medii, ulnaris medii, and abductor annularis, which is the only 
bicipital one in the series. The palmar interossei are adductor annularis 
and a long (carpal) and a s]iort (metacarpal) adductor indicis inserted 
separately, (Plate XXYIIL, Fig. 5.) 
