. A text-book of invertebrate morphology. Invertebrates. 74 INVERTEBRATE MORPHOLOGY. 3. Order Spiculispongise. The skeleton in the Spiculispongiae is occasionally entirely wanting, as in the genus Ilalisarca, but usually consists of siliceous spicules usually tetraxial or rod- or club-shaped, sometimes interlocking with one another so as to form a firm. Fig. 37.—A small Spongilla with only a single Osculum (from Hdxlet). a = inhalent pore. c = ciliated chamber seeu through d = osculum. the tissues. skeleton. One of the members of the group is the "boring sponge," Cliona, which excava
. A text-book of invertebrate morphology. Invertebrates. 74 INVERTEBRATE MORPHOLOGY. 3. Order Spiculispongise. The skeleton in the Spiculispongiae is occasionally entirely wanting, as in the genus Ilalisarca, but usually consists of siliceous spicules usually tetraxial or rod- or club-shaped, sometimes interlocking with one another so as to form a firm. Fig. 37.—A small Spongilla with only a single Osculum (from Hdxlet). a = inhalent pore. c = ciliated chamber seeu through d = osculum. the tissues. skeleton. One of the members of the group is the "boring sponge," Cliona, which excavates channels in and assists in the disintegration of oyster-shells, frequently attacking the shells of living animals and contributing to their destruction. 4. Order Hyalospongise. The Hyalospongise are essentially deep-sea forms, and are characterized by the possession of sis-rayed siliceous spicules as skeletal elements. The spicules may become fused to- gether to form a firm siliceous network having the appear- ance of spun glass, as in the genus Euplectella, commonly known as Venus' Flower-basket. Beproduction of the Pori/era.—Sexual reproduction occurs probably throughout the entire group of the Sponges, the re-. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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