The Cambridge natural history, Vol. 01 (of 10)PORIFERA (SPONGES)Reading editionChapter navigation30 reading sectionsGo to chapterChoose a chapter…Front matterSCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOKPROTOZOAChapter IChapter IIChapter IIIChapter IVChapter VChapter VIPORIFERA (SPONGES)Chapter VIIChapter VIIIChapter IXCOELENTERATA AND CTENOPHORAChapter XChapter XIChapter XIIChapter XIIIChapter XIVChapter XVECHINODERMATAChapter XVIChapter XVIIChapter XVIIIChapter XVIII · (continued 2)Chapter XIXChapter XXChapter XXIINDEXINDEX (continued 2)Previous chapter ←Chapter VINext chapter →Chapter VIIAll chapters and sections (30)Opening pagesFront matterOther sectionsSCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOKPROTOZOAChapters123456Other sectionsPORIFERA (SPONGES)Chapters789Other sectionsCOELENTERATA AND CTENOPHORAChapters101112131415Other sectionsECHINODERMATAChapters16171818192021Other sectionsINDEXINDEX (continued 2)BY◇IGERNA B. J. SOLLAS, B.Sc. (Lond.)◇Lecturer on Zoology at Newnham College, Cambridge.◇← CHAPTER VICHAPTER VII →