Chapter VIII
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PORIFERA (_CONTINUED_): FORMS OF SPICULES—CALCAREA—HOMOCOELA
—HETEROCOELA—HEXACTINELLIDA—DEMOSPONGIAE—TETRACTINELLIDA
—MONAXONIDA—CERATOSA—KEY TO BRITISH GENERA OF SPONGES 183
CHAPTER IX
PORIFERA (_CONTINUED_): REPRODUCTION, SEXUAL AND ASEXUAL—PHYSIOLOGY
—DISTRIBUTION—FLINTS 226
COELENTERATA
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The Cambridge natural history, Vol. 01 (of 10)Chapter VIII
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