359 
chialis. No fibres were found to reinforce the M. coraco - olecranalis 
from the capsule of the shoulder joint, as described by MACALISTER 
and Le DougL£ for this muscle in man. 
Near its origin, the M. 
coraco-olecranalis crosses 
the M. coraco-brachialis 
and its proximal belly lies 
upon the tendon common 
to the Mm. latissimus dorsi 
and teres major, the post- 
erior border of the M. biceps 
and the M. anconaeus pos- 
terior. The distal belly of 
the M. coraco - olecranalis 
lies upon the M. anconaeus 
internus, but near its lower 
end the muscle tapers and 
its muscular fibres become 
Dissection of muscles of left arm of Cat (Felis domestica) showing M. coraco-olecranalis 
Half natural size. Princeton Morphological Museum No. 621. 
An, ep. M. anconaeus epitrochlearis of Woop or Anconé interne of STRAUSS-DÜRCK- 
HEIM ete, 4. 7. M. anconaeus internus. 4. long. M. anconaeus longus. A, p. M. an- 
conaeus posterior. Bi. M, biceps. Cor, br. M. coraco-brachialis. Cor, ol. M. coraco- 
olecranalis of HUMPHRY or M. anconaeus coracoideus of FÜRBRINGER, J. a. /, M. extensor 
antibrachii longus. Lat, dor. M. latissimus dorsi, Sub. sc. M. subscapularis. Sup. sp. 
M. supraspinatus. Ter. maj. M. teres major, 
directly continuous with those of the anterior border of the M. anconaeus 
internus, with which muscle it is inserted into the inner side of the 
olecranon process of the ulna. 
The M. coraco-olecranalis is covered, at its point of insertion, by 
the M. anconaeus epitrochlearis of Woop (an. ep. Figure), and for 
about 16 millimeters proximad of this point, the Mm. coraco- olecra- 
nalis and anconaeus internus are so closely joined together, that the 
two muscles cannot be separated without making a false dissection. 
This close connection between the distal portions of these two muscles 
is not clearly represented in the Figure, as it was considered more 
desirable to indicate the exact point of insertion of the M. coraco- 
olecranalis. 
When first observed, this muscle was taken for the long head of 
the M. coraco-brachialis which has been described by WILDER and 
GAGE as occurring with considerable frequency in the cat. Concerning 
