. Animal life as affected by the natural conditions of existence. Animal ecology. 300 THE INFLUENCE OF INANIMATE SURROUNDINGS. but the species of Lym/nma, Planorbis, Physa, and Succinea, which also live in fresh water (see fig. 78), have no such pro- tection, and the mouth of the shell is remarkably large. Research has shown that, as a fact, operculated snails resist injurious influences far more successfully than those without an operculum. According to this the species of the inoperculated fresh-water univalves ought to exhibit a much sharper differen- tiation into separate species according
. Animal life as affected by the natural conditions of existence. Animal ecology. 300 THE INFLUENCE OF INANIMATE SURROUNDINGS. but the species of Lym/nma, Planorbis, Physa, and Succinea, which also live in fresh water (see fig. 78), have no such pro- tection, and the mouth of the shell is remarkably large. Research has shown that, as a fact, operculated snails resist injurious influences far more successfully than those without an operculum. According to this the species of the inoperculated fresh-water univalves ought to exhibit a much sharper differen- tiation into separate species according to their habitat than the. 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 Semper, C. (Carl), 1832-1893. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishernewyo, bookyear1881
