. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 331.—Shells of living foraminifera: A, textularia variabilis; B, pene- roplis planatus; C, rotalia concamerata. (After Williamson.) The figures are greatly enlarged. The glass sponge, such as the Venus's flower-basket— Euplectella—with its beautiful and intricate mesh of glass fibers, is similarly produced by a deposit of silica in the tissues of the animal. The classification of sponges is based on the character of the skeleton. There are horny sponges, glass sponges, and ca
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 331.—Shells of living foraminifera: A, textularia variabilis; B, pene- roplis planatus; C, rotalia concamerata. (After Williamson.) The figures are greatly enlarged. The glass sponge, such as the Venus's flower-basket— Euplectella—with its beautiful and intricate mesh of glass fibers, is similarly produced by a deposit of silica in the tissues of the animal. The classification of sponges is based on the character of the skeleton. There are horny sponges, glass sponges, and calcareous 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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