. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. the tentacles soft and free (Fig. 327). When the coral %eems to disappear, as in a cell, it is simply the with- drawal of the soft up- " per parts into the lower calcareous part or thg- ca. In the dead coral the organic matter dis- appears and leaves the cuplike theca showing the radiated structure of the animal (Fig. 328, a and b). Theca.—Only recently has the origin of the theca been well understood. It was formerly supposed that the coral limestone was deposited in the sub
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. the tentacles soft and free (Fig. 327). When the coral %eems to disappear, as in a cell, it is simply the with- drawal of the soft up- " per parts into the lower calcareous part or thg- ca. In the dead coral the organic matter dis- appears and leaves the cuplike theca showing the radiated structure of the animal (Fig. 328, a and b). Theca.—Only recently has the origin of the theca been well understood. It was formerly supposed that the coral limestone was deposited in the substance of the tissues, and there- fore constituted a sort of endoskeleton. But now it is known to be a true exo- skeleton or an epidermal structure. The mode of formation seems to be as follows: (1) The basal 0t"' Fig. 328.—a, stony part of a single coral; 6, section of same, showing 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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