racica_. Neither the axillary artery nor
these pectoral arteries were traced in my study.

The coracoid artery (2) arises from the ventral face of the subclavian
(1), either opposite the base of, or medial to, the axillary artery
(10). The coracoid artery passes ventrad between the medial edge of the
coracoid and the ventral head of _M. subcoracoideus_, and an artery (7)
is given off to supply that muscle. The main vessel then penetrates _M.
supracoracoideus_ and bifurcates or ramifies into several vessels (12).

Between the origin of the coracoid artery from the subclavian, and the
point where the coracoid artery passes the medial edge of the coracoid,
several branches are given off. These vessels are highly variable in
origin, as described below, and not all were always found. Along with
the coracoid artery, they are termed a "coracoid complex."

The first artery (11) of this complex arises from any one of several
places: from the lateral face of the coracoid artery at its base;
independently from the subclavian immediately lateral to the origin of
the coracoid artery; and from the thoracic artery near its origin. This
vessel travels laterad, parallel to the subclavian, and penetrates _M.
coracobrachialis posterior_ at the same point that the pectoral artery
passes dorsal to that muscle.

Another vessel (common stem of 4 and 5) of the coracoid complex in most
specimens arises from the anterior face of the coracoid artery and
branches into several vessels, some of which (5) supply _M.
subcoracoideus_, and some of which (4) feed _M. coracobrachialis
posterior_. The vessel occasionally shares a common stem with the main
vessel (11) to _M. coracobrachialis posterior_, and in some specimens
arises independently from the subclavian, immediately anterior to the
origin of the coracoid artery. The branch (4) to _M. coracobrachialis
posterior_ was also seen to arise independently from any of the
above-mentioned positions.

Two remaining vessels (6 and 8) are often found as branches from the
coracoid artery. They were small and often were collapsed in the
individuals I dissected, but were most clearly seen in _Iridoprocne
bicolor_. The vessels occasionally had a common base, and in some
specimens only one vessel was found. The first artery (6) passes mediad
into _M. sternocoracoideus_, or continues across that muscle onto the
inner face of the sternum. The second vessel (8) also supplies _M.
sternocoracoideus_ or the inner