Shells of Land and Water; A Familiar Introduction to the Study of the Mollusks

Shells of Land and Water; A Familiar Introduction to the Study of the Mollusks

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...highly ornamented, with frills and folds. The aperture of the drill was tinted a dark purple, and was very narrow at the lower end, and Shell of the drm-Umal_ formed a little canal through which the siphon inx cinereus, showing the was thrust. We learned that very frequently, lfl: f,, ', ', t: _" ',;, kle c', ', l,1, e, l;' there were two canals, one at each end of the "P"P"t""ib"'bdf'"h'li aperture, called respectively the anterior and sp-Professor Parker, " that in most of those shells having a canal in connection with the aperture, the animal is carnivorous, and lives by preying upon other animals. as does the lion and the tiger, while in those shells with a rounded aperture, the animal generally subsists upon vegetable food. "The mantle of the drill," continued the Professor, " as indeed of other snails, is a closed sac which communicates with the water by means of one or two siphons. The anterior siphon, which is extended through the long anterior canal, is rather long and is generally reflected, or turned back toward the shell. In some genera of snails there is a posterior siphon of greater or lesser length, which extends through the posterior canal, and expels the water from the gills in addition to the waste matter from the intestine. In a few snails, as Cypraza and Ovula, the posterior canal, instead lar canal. It will be seen after examining our drill, that it is typical of the great class of mollusks which inhabit the sea, and are called Gastropods because the foot or organ of locomotion is on the lower side of the body, and the animal apparently crawls upon its stomach. The name Gastropod is from the Greek and...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236822854
  • 9781236822857