(2) Ichthyotomi†; e.g. Pleuracanthus.

(3) Acanthodei†; e.g. Acanthodes.

(4) Plagiostomi.

(a) Selachii; e.g. many extinct and all living Sharks and Dog-Fishes.

(b) Batoidei; e.g. Skates and Rays.

(5) Holocephali; e.g. Chimaera and Callorhynchus.

(ii.) Teleostomi; e.g. such well-known Fishes as the Perch, Cod, Salmon, and Herring, and also the less familiar "Ganoids," living and extinct.

(1) Crossopterygii; e.g. Polypterus.

(2) Chondrostei; e.g. the Sturgeons (Acipenser).

(3) Holostei; e.g. the Bow-fin (Amia), and the Gar Pike (Lepidosteus).