MR, ST. G. MIVART ON THE ANATOMY OF ECHIDNA HYSTRIX. 985 
and outer side of the tendon of origin of the feres major. It passes downwards, and 
becomes intimately connected with the second part of the latissimus dorsi, in common 
with which it is inserted, by a very strong tendon, into the internal condyle of the 
humerus. This muscle appears to me to represent the dorso-epitrochlear. Its origin is 
very similar to that of the last-named muscle in the Hyrax', though its insertion is 
certainly different, and it might perhaps be regarded as a separate portion of the teres 
major. 
A small delicate muscle closely connected with the outer surface of the capsular liga- 
ment arises from the external surface of the scapula, just anterior to the lowest part of 
the origin of the scapular head of the triceps. It passes downwards and backwards, and 
is inserted into the anterior part of the lesser tuberosity of the humerus, immediately 
beneath, and in front of, the insertion of the subscapularis. 
Coraco-brachialis (Plate LII. fig. 2, c.B).—This muscle is very largely developed, and 
consists of at least two distinct parts, one long and the other short. Both portions have 
acommon origin, and arise from the distal end of the coracoid, and chiefly from that 
part of it which looks towards the first rib. The long part passes downwards, and is 
inserted into the internal condyle of the humerus and into a slight ridge running up 
obliquely from that condyle on the anterior surface of the bone. There is a good deal 
of tendinous fibre at the common origin; but that border of the long portion which is 
next the biceps is especially tendinous. 
The short portion is inserted into the whole anterior face of the lesser tuberosity and 
into part of the wide bicipital groove, and is covered by the long portion. A similar 
division of the coraco-brachialis appears to exist in the Ornithorhynchus’. 
Besides this double coraco-brachialis, there is a small third portion, unless indeed it 
should be reckoned as a distinct muscle. This arises from the external part of the deep 
or inner surface of the epicoracoid, and is inserted, by a distinct tendon, into the lesser 
tuberosity of the humerus, close and somewhat superficial to the insertion of the sub- 
scapularis. At its innermost part it is intimately united with the adjacent portion of 
the short part of the coraco-brachialis. It appears to me not improbable that it may 
answer to the muscle which, in the common fowl, arises from the inner surface of the 
coracoid, and is inserted into the lesser tuberosity of the humerus. 
Another small muscle arises from the inside of the epicoracoid, internal to (nearer to 
the middle line of the body than) the muscle (or portion of a muscle) last described. It 
passes downwards and inwards, and is inserted into the inside of the manubrium and 
base of the interclavicle. : 
The biceps (Plate LII. fig. 2, B.) has but a single head, thus differing from the Ornitho- 
thynchus, It is thick and fleshy near its origin, but towards its insertion expands in the 
direction of the long axis of the forearm. It arises mainly from the strong tendon of 
the coraco-brachialis, but also in part from the coracoid ; and some fibres take origin from 
* See Proceedings Zool. Soc. 1865, pp. 339 (fig. 5, D. e.) 340. 
2 Meckel, loc. cit. tab. v. no. 22 & 25; and Owen, loc. m p. 381. 
3 Meckel, loc. cit. tab. v. no. 23 & 24; and Owen, loc. cit. p. 381. 
