Through a pocket lensNote 9 — Chapter II · ARTHROPODS AND THEIR CLASSES.—THE MARGINED WATER BEETLE; THE GREAT WATER BEETLE; THE COCKTAIL BEETLEReading editionPopular History of the Aquarium, p. 258.◇Copy noteReturn to CHAPTER II ARTHROPODS AND THEIR CLASSES.—THE MARGINED WATER BEETLE; THE GREAT WATER BEETLE; THE COCKTAIL BEETLE