. Beginners' Zoology . Fio 27 — B ith bponge Fig. 28. — Bath Sponge. branched or lobed? Compare a number of specimens (Figs. 26,27, 28) and decide whether the common sponge has a typicalshape. What features do their formspossess in common? Sponges are divided into three 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 spo
. Beginners' Zoology . Fio 27 — B ith bponge Fig. 28. — Bath Sponge. branched or lobed? Compare a number of specimens (Figs. 26,27, 28) and decide whether the common sponge has a typicalshape. What features do their formspossess in common? Sponges are divided into three 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 ^P°g^^ h^^^ ^^^ ^^^ skeleton glass sponge. is Composed of interweaving fibres of. 20 BEGINNERS ZOOLOGY
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