. Animal life as affected by the natural conditions of existence. Animal ecology. 300 THE INFLUENCE OF INANIMATE SUEEOUNDINGS. but the "species of LymncBa, Flanorhis, Physa, and Sucdnea, 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 miich sharper differen- tiation into separate species acc
. Animal life as affected by the natural conditions of existence. Animal ecology. 300 THE INFLUENCE OF INANIMATE SUEEOUNDINGS. but the "species of LymncBa, Flanorhis, Physa, and Sucdnea, 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 miich 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
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