Div. II. CARTILAGINOUS Fish

Div. II. CARTILAGINOUS Fish; the characters of which are: Breathing through certain apertures, generally placed on each side the neck; but in some instances beneath, in some above, and from one to seven in number on each part, except in the pipe-fish, which

has only one; the muscles supported by cartilages instead of bones. Example, the Picked Dog-fish, fig. 2. a, The lateral apertures.—The genera are, the Lamprey, Skate, Shark, Fishing-frog, Sturgeon, Sun-fish, Lump-fish, Pipe-fish.