Natural history of animals; . Fig. 392. — Fig. 393-— Fig- 394. — Periwinkle, Lacuna. Valvata. Fig. 395. — River Snail Shell, or Litorina. U. States, or Paludina. United States. 218 MOLLUSKS: GASTROPODS. from their shape ; the Cerithiums from a word whichmeans a horn. The Melanias are fresh-water shells,common in the Western and Southern States. Wentletraps, etc. The Tower Shell and the Worm-shell of the WestIndies, and the true Wentletraps of the tropical andtemperate seas, belong in this group. The RoyalStaircase, or Wentletrap, Figure 390, was formerlyvery valuable, and has been sold for a h
Natural history of animals; . Fig. 392. — Fig. 393-— Fig- 394. — Periwinkle, Lacuna. Valvata. Fig. 395. — River Snail Shell, or Litorina. U. States, or Paludina. United States. 218 MOLLUSKS: GASTROPODS. from their shape ; the Cerithiums from a word whichmeans a horn. The Melanias are fresh-water shells,common in the Western and Southern States. Wentletraps, etc. The Tower Shell and the Worm-shell of the WestIndies, and the true Wentletraps of the tropical andtemperate seas, belong in this group. The RoyalStaircase, or Wentletrap, Figure 390, was formerlyvery valuable, and has been sold for a hundred poundssterling, although now worth only a few dollars. Periwinkles. Periwinkles live in the sea near the shore. Twospecies are shown in Figures 392 and 393. They feedon algae, — marine plants. River Snails. These live in fresh water, have the shell coveredwith a green skin, bring forth their young alive, andthe embryo snails, even before birth and when so smallthat they can scarcely be seen without a microsco
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
