Fishes, too, though they may have snouts, have not noses, because they breathe by gills.

Some larvæ breathe by gills, and do not have spiracles until they are grown up, but all grown-upinsects breathe by spiracles.

The fish lives altogether in the water and breathes by gills, but the dipnoi among fishes breathes by lungs as well as gills.

BATRACHIANS.- Aclassof animals allied to the Reptiles, but undergoing a peculiar metamorphosis, in which the young animal is generally aquatic and breathes by gills.