. Biology and its makers. Biology -- History. ORGANIC EVOLUTION o - -> 653 pond-shell similar to the planorbis, which is so common at the present time. Fig. 104 shows some of these transformations, the finer. FIG. 104.—Planorbis Shells from Steinheim. (After Hyatt.) gradations being omitted. The shells from these two sources bear directly upon the question of whether or not species have held rigidly to their original form. 23. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illust
. Biology and its makers. Biology -- History. ORGANIC EVOLUTION o - -> 653 pond-shell similar to the planorbis, which is so common at the present time. Fig. 104 shows some of these transformations, the finer. FIG. 104.—Planorbis Shells from Steinheim. (After Hyatt.) gradations being omitted. The shells from these two sources bear directly upon the question of whether or not species have held rigidly to their original form. 23. 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 Locy, William A. (William Albert), 1857-1924. New York, H. Holt and Company
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