Beginners' zoology . Fig. 27. —Bath Sponge. Fig. 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 formspossess in common? Sponges are divided into f/iree classes,according as their skeletons are flinty(silicious), limy (calcareous), or horny. Some of the silicious sponges haveskeletons that resemble spun glass intheir delicacy. Flint is chemically nearlythe same as glass. The skeleton shownin Fig. 29 is that of a glass sponge whichlives near the Philippine Islands. The horny sp
Beginners' zoology . Fig. 27. —Bath Sponge. Fig. 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 formspossess in common? Sponges are divided into f/iree classes,according as their skeletons are flinty(silicious), limy (calcareous), or horny. Some of the silicious sponges haveskeletons that resemble spun glass intheir delicacy. Flint is chemically nearlythe same as glass. The skeleton shownin Fig. 29 is that of a glass sponge whichlives near the Philippine Islands. The horny sponges do not have spi-cules in their skeletons, as the flinty and ^^^^y sponges have, but the skeletonglass sponge. is Composed of interweaving fibres of
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
