. Natural history of animals. Containing brief descriptions of the animals figured on Tenney's Natural history tablets, but complete without the tablets. Zoology. SNAILS, OR GASTEROPODS. 197 SNAILS, OR GASTEROPODS. The term Gasteropod means stomach-footed, and is given to these animals because the lower side serves them as a sort of foot, by means of which they creep along. But this " foot" is in no way related to the feet of the backboned animals. Most of the Gastero- pods have a shell; and as this is made of only one piece, or valve, they are often called Univalves. Some, however,
. Natural history of animals. Containing brief descriptions of the animals figured on Tenney's Natural history tablets, but complete without the tablets. Zoology. SNAILS, OR GASTEROPODS. 197 SNAILS, OR GASTEROPODS. The term Gasteropod means stomach-footed, and is given to these animals because the lower side serves them as a sort of foot, by means of which they creep along. But this " foot" is in no way related to the feet of the backboned animals. Most of the Gastero- pods have a shell; and as this is made of only one piece, or valve, they are often called Univalves. Some, however, have no shell in the adult state, though all have a shell when first hatched. Most Gasteropods have a lid or door, called the operculum, with which they close the opening to the shell when they withdraw within. It is a horny plate, sometimes strengthened by shelly matter. Their eyes are two, and generally on long stalks, as seen in Figure 356; they perceive light, Apex Suture ,.,; /TTT \ .';::':f-'---tW » Spire. W, whorls. Lines of growth :;. Umbilicus ^. rig. 364. — Names of the parts of a Gasteropod Shell. but probably cannot distinguish objects. Many of the Gasteropods have horny jaws; but one of the most curious parts of these animals is the tongue, or lingual ribbon, which is a baud armed with a great number of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tenney, Sanborn, 1827-1877; Tenney, Abby Amy (Gove) 1836-. New York, Scribner, Armstrong
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1875
