First lesson in zoology : adapted for use in schools . ut nearly all agree in having two valves,while the animal is headless, with a small foot,—though thismay be occasionally, as in the oyster, wanting,—and thereare usually two pairs of leaf-like gills. By examining thekinds we have described as examples or types, the studentcan get a good idea of the appearance of aU the members ofthe class Lamellibranchiata, which means shell-fish withleaf-like gills. CHAPTER IX. SNAILS AND OTHER UNIVALVE SHELLFISH. Snails can be picked up anywhere on the seacoast, in pondsand riTers, or in damp places on l
First lesson in zoology : adapted for use in schools . ut nearly all agree in having two valves,while the animal is headless, with a small foot,—though thismay be occasionally, as in the oyster, wanting,—and thereare usually two pairs of leaf-like gills. By examining thekinds we have described as examples or types, the studentcan get a good idea of the appearance of aU the members ofthe class Lamellibranchiata, which means shell-fish withleaf-like gills. CHAPTER IX. SNAILS AND OTHER UNIVALVE SHELLFISH. Snails can be picked up anywhere on the seacoast, in pondsand riTers, or in damp places on land under sticks or common large land-snail is called Helix aliolabris(Fig. 71), and Pig. 72 represents the shell of a examining such a shell we see that it consists of hutone piece or yalve; hence this and allsuch shells are called also see that the shell is twistedin a spiral, and the twists are calledwhorls; the crease between anytwo of the whorls is called the su-ture. The first whorl forms the body
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
