. Animal biology; Human biology. Parts II & III of First course in biology. Biology. FIG. 27. — Bath Sponge. FlG. 28. — Bath Sponge. branched or lobed? Compare a number of specimens (Figs. 26, 27, 28) and decide whether the common sponge has a typical shape. What features do their forms possess in common? Sponges are divided into three classes, according as their skeletons are flinty (silicious), limy (calcareous), or horny. Some of the silicious sponges have skeletons that resemble spun glass in their delicacy. Flint is chemically nearly the same as glass. The skeleton shown in Fig. 29 is
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. FIG. 27. — Bath Sponge. FlG. 28. — Bath Sponge. branched or lobed? Compare a number of specimens (Figs. 26, 27, 28) and decide whether the common sponge has a typical shape. What features do their forms possess in common? Sponges are divided into three classes, according as their skeletons are flinty (silicious), limy (calcareous), or horny. Some of the silicious sponges have skeletons that resemble spun glass in their delicacy. Flint is chemically nearly the same as glass. The skeleton shown in Fig. 29 is that of a glass sponge which lives near the Philippine Islands. The horny sponges do not have spi- cules in their skeletons, as the flinty and limy sponges have, but the skeleton FIG. 29. — Skeleton of a glass sponge. is composed of interweaving fibers of. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1910
