1. The _superficial flexor_ or _perforatus tendon_ (Figs. 15, _b_, and 16, _a_, _b_) lies behind, immediately under the skin, and covers the deep flexor or perforans tendon. At the gliding surface between the sesamoid bones (Fig. 15, _f_) it broadens, and forms a ring or tube (Fig. 15, _b′_) through which the perforans tendon (_a‴_) passes, while a short distance farther down it bifurcates, or divides into two branches (Figs. 15, _b″_, and 16, _b_), which terminate, one on either side, partly on the inferior lateral borders of the first phalanx and partly on the fibro-cartilage of the second phalanx. It acts simultaneously on the long and short pasterns. 2. The _deep flexor_ or _perforans tendon_ (Figs. 15, _a_, and 16, _c_) is cylindrical and stronger than the perforatus tendon; above the fetlock-joint it lies between the perforatus and the suspensory ligament of the fetlock. At the sesamoid bones it passes through the ring formed by the perforatus tendon (Fig. 15, _b′_), then becomes broad and double-edged, passes between the two terminal branches of the perforatus, glides over the fibro-cartilage of the second phalanx and over the inferior surface of the navicular bone, and finally ends on the semilunar crest of the third phalanx. In common with the perforatus tendon it flexes the foot. [Illustration: FIG. 16. Right forefoot seen from behind and a little from the external side: _a_, perforatus tendon; _b_, terminal branches of the same; _c_, perforans tendon; _d_, annular ligament which attaches to the sesamoid bones: _d′_, the “x” ligament, which attaches by four branches to the os suffraginis; _d″_, an upper branch of the same (the lower branches are not shown in the figure); _e_, reinforcing sheath of the perforans tendon, covering the under surface of the latter and attached by its branches at _e′_ to the lower end of the os suffraginis; _f_, suspensory ligament of the fetlock.]