. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... protect them fromthe effects of acids which may be present in thefresh water. Sometimes the beaks are consider-ably eroded. Limnaa stagndlis, Limi., thePond Limnapa, Figure 127, is thehirgest of this class of fresh-watermollusks, and is universally dis-tributed, both in this country andin the Old World. It is a very dis-tinct species, and can be instantlyrecognized. Spire very sl
. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... protect them fromthe effects of acids which may be present in thefresh water. Sometimes the beaks are consider-ably eroded. Limnaa stagndlis, Limi., thePond Limnapa, Figure 127, is thehirgest of this class of fresh-watermollusks, and is universally dis-tributed, both in this country andin the Old World. It is a very dis-tinct species, and can be instantlyrecognized. Spire very slender,body-whorl and aperture very large;shell thin and delicate. It growssometimes to a length of nearly twoinches. This mollusk inhabits lakes and rivers,and is found on the Sierras, in Utah, and in manyother localities. Limnaa palustris, MiilL, the MarshLimnaea, is shown in Figure 128, It isfound all Iound the world, in the north-ern hemisphere. The whorls are rounded,five or six in number, and the apertureis shorter than the spire. The shell ishorn-colored, and its form is well repre-sented in the figure, which is larger thanthe average specimen. There are manyvarieties of this widely distributed
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
