The _internal mammary_, Fig. 60, im, is a rather small vein, bringing blood from the ventral wall of the thorax. It may be followed along the inner surface of the ribs, near the sternum, in company with its corresponding artery. The _vertebral_ vein, Fig. 60, v, is also of small diameter and extends to the dorsal body wall near the spinal column, from which region it returns blood to the anterior vena cava; it is drawn too large in the figure. [Illustration: FIG. 60. The veins of the anterior region of the Florida alligator. The veins of the left foreleg are shown at A.--For lettering, see pages 224-25.] Just cephalad to the vertebral and internal mammary, the _internal jugular_, j, enters the precava. The internal jugular may be followed directly forward, close to the side of the trachea and œsophagus, from which it receives numerous branches. Near its point of entrance to, or rather exit from, the skull, it anastomoses, by two or three short branches, with the external jugular, ej, to be described later. Its distribution in the cranial cavity could not be determined in the available material. At the point of entry of the internal jugular the precava passes laterad for a short distance and then divides into two more or less equal branches, the above-mentioned external jugular, ej, and the subclavian, s, of which the latter will first be described. The _subclavian_, s, of course, returns blood from the regions of the shoulder and arm. On reaching the body wall, where it might be called the _axillary_, ax, it receives, on its posterior side, a large _thoracic_ vein, t, which returns blood from the thorax, shoulder, and skin. The thoracic receives a branch from the posterior surface of the arm, which might be called the _postbrachial_, pb; this postbrachial may be traced, as a rather small vessel, to the hand; at the elbow it is connected, by one or more small branches, with the brachial. Just distal to the thoracic the axillary vein receives two fairly large vessels, the _subscapulars_, sc, that return blood from the shoulder and upper arm. After receiving the subscapulars, the axillary may be followed into the upper arm as the _brachial_, br. As has been said, the brachial and postbrachial anastomose near the elbow, and in this region the former receives a small vessel that extends parallel to it from the manus. In the forearm the brachial may be called the _radial_, Fig. 60, A, ra; on the back of the manus the radial receives branches from the various digits and from a rather complex plexus of vessels in the carpal region.