Note 2760 — BOOK IX. THE NATURAL HISTORY OF FISHES. (continued 2)

Aristotle says, that the chalcis is greatly tormented by sea-fleas, which attach themselves to its gills. Cuvier remarks, that a great number of fish are subject to have the gills attacked by parasitical animals of the genus Lernæa or that of the monoculi of Linnæus, which have been divided into many classes since. They have nothing in common, he says, with the land-flea, except the name and the property of living at the expense of other animals.