peroneus brevis_ Per. long. _M. peroneus longus_ Pirif. _M. piriformis_ Plan. _M. plantaris_ Posterolat. can. Posterolateral canal of hypotarsus Posteromed. can. Posteromedial canal of hypotarsus Sar. _M. sartorius_ Semim. _M. semimembranosus_ Semit. _M. semitendinosus_ Tib. ant. _M. tibialis anticus_ Tib. cart. Tibial cartilage [Illustration: FIG. 1. _Pipilo erythrophthalmus._ Lateral view of the superficial muscles of the left leg, × 1.5.] [Illustration: FIG. 2. _Pipilo erythrophthalmus._ Lateral view of the left leg showing a deeper set of muscles. The superficial muscles _iliotibialis_, _sartorius_, _gastrocnemius_ and _peroneus longus_ have been removed, × 1.5.] [Illustration: FIG. 3. _Pipilo erythrophthalmus._ Lateral view of the left leg showing the still deeper muscles. In addition to those listed for figure 2, the following muscles have been wholly or partly removed: _iliotrochantericus posticus_, _femorotibialis externus_, _femorotibialis medius_, _biceps femoris_, _semitendinosus_, _tibialis anticus_, _flexor perforans et perforatus digiti II_, and _flexor perforans et perforatus digiti III_, × 1.5.] [Illustration: FIG. 4. _Pipilo erythrophthalmus._ Medial view of the superficial muscles of the left leg, × 1.5.] [Illustration: FIG. 5. _Pipilo erythrophthalmus._ Medial view of the left leg showing a deeper set of muscles than those seen in figure 4. The following superficial muscles have been removed: _iliotibialis_, _sartorius_, _femorotibialis internus_, _obturator internus_, _adductor longus (pars posticus)_, _gastrocnemius_, and _peroneus longus_, × 1.5.] [Illustration: FIG. 6. _Pipilo erythrophthalmus._ Proximal end of left tarsometatarsus and the hypotarsus, × 4.] [Illustration: FIG. 7. _Pipilo erythrophthalmus._ Lateral view of proximal end of left femur and a portion of the pelvis, × 3.5.] [Illustration: FIG. 8. _Pipilo erythrophthalmus._ Upper surfaces of the phalanges of the foretoes of the left foot showing insertions of the _M. extensor digitorum longus_, × 3.] [Illustration: FIG. 9. _Pipilo erythrophthalmus._ Medial view of the second digit of the left foot, showing insertions of the flexor muscles, × 3.]