A Plain and Easy Account of the Land and Fresh-Water Mollusks of Great Britain: Containing Descriptions, Figures, and a Familiar Account of the Habits of Each Species (Classic Reprint)

Excerpt from A Plain and Easy Account of the Land and Fresh-Water Mollusks of Great Britain: Containing Descriptions, Figures, and a Familiar Account of the Habits of Each Species

The snail-like animals have a distinct head, provided with eyes, horns or tentacles, and a mouth armed with cutting jaws the under side of the body forms a Single muscular foot, on which the animal creeps. The body is usually protected by a Shell composed of one piece. Among these belly-footed animals some live in the water, and breathe by means of gills, -these are the true Gasteropoci'a; others live on the land, as the snail and slug, and have the respi ratory organ in the form of a lung, - these are comprised in the class Pulmonéfem. Some, indeed, inhabit our fresh waters 5 but, unlike the true fresh-water Gasteropods, they are compelled to come to the surface to breathe the air, and are not capable of suffering a long immersion in the water.

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