D. The tibia; d, the inner malleolus. E E. The tendon of the flexor longus digitorum muscle. F. The gastrocnemius muscle; f, the tendo Achillis. G. The soleus muscle. H. The tendon of the plantaris muscle. I I. The venae comites. K K. The posterior tibial artery. L L. The posterior tibial nerve. FIGURE 2. A. The tibialis anticus muscle; a, its tendon. B. The extensor longus digitorum muscle; b b b b, its four tendons. C C. The extensor longus pollicis muscle. D D. The tibia. E. The fibula; e, the outer malleolus. F F. The tendon of the peronaeus longus muscle. G G. The peronaeus brevis muscle; i, the peronaeus tertius. H H. The fascia. K. The extensor brevis digitorum muscle; k k, its tendons. L L. The anterior tibial artery and nerve descending to the dorsum of the foot. [Illustration: Legs, showing muscles, blood vessels and other internal organs.] Plate 67, Figures 1, 2 PLATE 68. FIGURE 1. A. The calcaneum. B. The plantar fascia and flexor brevis digitorum muscle cut; b b b, its tendons. C. The abductor minimi digiti muscle. D. The abductor pollicis muscle. E. The flexor accessorius muscle. F. The tendon of the flexor longus digitorum muscle, subdividing into f f f f, tendons for the four outer toes. G. The tendon of the flexor pollicis longus muscle. H. The flexor pollicis brevis muscle. i i i i. The four lumbricales muscles. K. The external plantar nerve. L. The external plantar artery. M. The internal plantar nerve and artery. [Illustration: Bottom of left foot, showing muscles, blood vessels and other internal organs.] Plate 68, Figure 1 FIGURE 2. A. The heel covered by the integument. B. The plantar fascia and flexor brevis digitorum muscle cut; b b b, the tendons of the muscle. C. The abductor minimi digiti. D. The abductor pollicis. E. The flexor accessorius cut. F. The tendon of the flexor digitorum longus cut; f f f, its digital ends. G. The tendon of the flexor pollicis. H. The head of the first metatarsal bone. I. The tendon of the tibialis posticus. K. The external plantar nerve. L L. The arch of the external plantar artery. M M M M. The four interosseous muscles. N. The external plantar nerve and artery cut. [Illustration: Bottom of left foot, showing muscles, blood vessels and other internal organs.] Plate 68, Figure 2 CONCLUDING COMMENTARY. ON THE FORM AND DISTRIBUTION OF THE VASCULAR SYSTEM AS A WHOLE. ANOMALIES.--RAMIFICATION.--ANASTOMOSIS.