Comparative zoology, structural and systematic - for use in schools and colleges (1883) (20644757026)

Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library



Text Appearing Before Image:
MOLLUSCA. 275 earthy matter) than those of marine Mollusks, having to be carried on the back without the support of the water.
Text Appearing After Image:
Fig. 232.—A, Land-snail (Helix); B, C, A Slugs (Limax); E, F, G, Pond-snails (Limncea, Paludina, and Planorbis). Their eggs are laid singly, while the eggs of other orders are laid in chains. They are found in all zones, but are most numerous where lime and moisture abound. All feed on vegetable matter. A few are naked, as the Slug; some are terrestrial; others live in fresh water. The Land - snails, represented by the common Helix, the gigantic Bulimus, and the Slug (Limax), are distinguished by their four " horns," the short front pair being the true tentacles, and the long hinder pair being the eye-stumps. They have a saw - like upper jaw for biting leaves, and a short tongue covered with minute teeth. The Pond-snails, as Limnaea and Planorbis, differ