1869.] THE MYOLOGY OF MENOPOMA, 265 
from the lateral muscular mass just at the lateral longitudinal groove, 
and is inserted on the inner side of the upper part of the scapula. 
The levator anguli scapule (fig. 5, L. A. 8) is the antagonist 
of the muscle last described. It is very long and slender, and arises 
from the hinder and inferior margin of the exoccipital, and is inserted 
into the upper part of the inner side of the scapula. 
The omo-hyoid has been already described as the last but one of 
the muscles of the head. 
The subclavius* (figs. 2, 3, 5, & 6, S.) arises from the outer sur- 
face of the precoracoid (of Parker) and, passing backwards beside 
the coraco-brachialis, and more or less connected with the latter, is 
inserted into the summit of the great tuberosity. 
Coraco-brachialis (fig. 2, C. B). This muscle is large, and con- 
sists of two parts. The first of these springs from the whole surface 
of the coracoid, and is partly covered up by the pectoralis; it is 
inserted into the inner side of the radial tuberosity of the humerus. 
The second part, thick and long, arises from the posterior margin of 
the coracoid, close behind the glenoid cavity; passing down into 
the bend of the elbow-joint, it is inserted into the shaft of the 
humerus down to the internal condyle. 
Deltoid (figs. 3, 5, & 6, D). A muscle which may perhaps 
answer to the deltoid of higher forms springs from the outside of 
the scapula, and passing down is inserted into the outer side of the 
radial tuberosity, near its summit. 
Subscapularis. A very small triangular muscle, springing from 
the inner side of the scapula close to the glenoid surface, and im- 
planted into the humerus. It passes between the two heads of the 
triceps, which spring from the scapular arch. 
Biceps (figs. 2 & 3, B). This muscle, which appears to answer 
both to the biceps and brachialis anticus of higher animals, consists 
perhaps of two parts, though one is with difficulty separable from the 
long coraco-brachialis. This latter portion springs from the poste- 
rior margin of the coracoid, close to the glenoid surface ; and a strong 
tendon runs along it. The other part arises from the front of the 
shaft of the humerus, immediately below the insertions of the pecto- 
ralis and subelavius. The muscle is partly inserted into the shaft of 
the radius, and in part fuses with the supinator longus. 
Triceps (figs. 2 & 3, 7’). This is a large muscle arising partly, 
by a considerable head, from the junction of the scapula and cora- 
coid just in front of the glenoid surface, by another and much smaller 
head from the inner surface of the coracoid, just behind the glenoid 
surface. It also takes origin from the inner and outer surfaces of 
the humerus near its summit, and it receives an accession by the 
union of the latissimus dorsi, It is implanted into the proximal 
end of the ulna. 
Supinator longus (figs. 2, 24, 3, & 4, 8. LZ). <A thick muscle 
which may be thus named springs from the radial side of the lower 
* Prof. Rolleston has shown, I think conclusively, that my epicoraco-humeral 
is really the subclavius; and the muscle here described in Menopoma may 
probably be the same as my epicoraco-humeral. 
