. The illustrated natural history [microform]. Reptiles; Fishes; Mollusks; Natural history; Reptiles; Poissons; Mollusques; Sciences naturelles. nAM'S-IIOUN APPLE-SNAIL WATER-SNATL.—/.imnTO stcigiuilia. Aminilliiria (ornn-nrirtin. POUCH-SHELL.—r/i!/,OT hypn&nim. COMMON rLANOnniS. -rianorhis conieut. STAIRCASE APPLE-SnELL.—/Im;ii(/Wria snrWria. RIVFCR hlMVluT—Axci/lm Uinislrii. ..+#* Ml! ; ::i; ! V f his neighbour, ng tlio original 'ost of the field, ^'ering numbers lad been buried r and terminate emerging from mities of short and stout footstalks, and tlie enormously long tentacles are pla
. The illustrated natural history [microform]. Reptiles; Fishes; Mollusks; Natural history; Reptiles; Poissons; Mollusques; Sciences naturelles. nAM'S-IIOUN APPLE-SNAIL WATER-SNATL.—/.imnTO stcigiuilia. Aminilliiria (ornn-nrirtin. POUCH-SHELL.—r/i!/,OT hypn&nim. COMMON rLANOnniS. -rianorhis conieut. STAIRCASE APPLE-SnELL.—/Im;ii(/Wria snrWria. RIVFCR hlMVluT—Axci/lm Uinislrii. ..+#* Ml! ; ::i; ! V f his neighbour, ng tlio original 'ost of the field, ^'ering numbers lad been buried r and terminate emerging from mities of short and stout footstalks, and tlie enormously long tentacles are placed j'ust in front of the eyes. At the first glance the creature appears to have four tentacles, but; on a closer examiiuition, tlie front pair are seen to be merely developments of the muzzle. In one respect, the Ampullaria seems to be a connecting link between the gill-bearing and lung- bearing molluscs, being said by high authorities to possess a pulmonic or lung sac, in addition to its gills. Ox the left hand of the illustration the common Pond-sxail, or Limx/EA, is shown in the act of climlnng iij) the stem of a water-plant. In all the members of this family the shell is thin, and sufHciently capacious to contain the entire animal when it desires to withdraw itself into its home. The aperture is simply rounded, without notches or ridges, and the lip is sharp. The Pond-snail may be found in almost any fresh water, and, if carefully watched, proves to be quite an interesting creature. It can creep witli tolerable rapidity after the usual manner of snails, and has besides a curious method of progression without making any exertion of its own. In streams, when the animal has a mind to change its locality without needing to exert itself, it achieves the task of converting the journey into a voyage, and its foot into a boat. This transformation is soon effected, the animal first np some plant that projects out of tlic water, reversing its position, ho that the
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Keywords: ., bookcentury1800, booksubj, booksubjectfishes, booksubjectmollusks
