Fig. 76. — Ganoid fishes — Polypteriis bi/u'r. 



Fig. jj. — Ganoid fishes — American bony pike, Lepidosteus. 



Photo : Thiele. 



Fig. 78.— Bony- or food-fishes— The Salmon. 



Fig. 79. — Bony- or food-fishes — The Common Eel. 



Photo : Underwood. 



