CONTENTS. 



ANATOMY AND PHYSIOLOar OP THE SPONaiADiE. 



Peeface .... 



OEQAlfOGEAPHT 



The Spicula . 



The Essential Skeleton Spicula 



Auxiliary Spicula 



Connecting Spicula 



Prehensile Spicula 



Defensive Spicula 



Internal Defensive Spicula 



Spicula of the Membranes . 



Tension Spicula 



Eetentive Spicula 



Anchorate Spicula 



Spicula of the Sarcdde 



Simple Stellate Spiciila . 



Compound Stellate Spicula . 



Spicula of the Ovaria and Gemmules 



Keratode 



PAOB 



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