K^ 





THIRD, OR GALLERY FLOOR. 

 Key-plan of the Museum building, showing the location of the hall in which the 

 specimens may be found to which references are made in this Guide Leaflet 



CONTENTS 



General Characteristics of Sponges 

 Anatomy ..... 



1. General Structure 



2. The Canal Systems 



(a) The Ascon Type 



(b) The Sycon Type 



(c) The Rhago.n Type 



3. The Skeleton 

 Reproduction and Development . 

 Physiology . . 

 Position of Sponges in the Animal Kingdom 

 Classification .... 



Typical Spo.mges in the Museum 



A. Calcareous Sponges 



homoccelida .... 

 Heteroccelida 



B. Xon-Calcareous Spo.N'Ges 



Hexactinellida 

 Tetractinellida 

 Monaxonida .... 

 Monoceratida 



The Com.mercial Sponges 



PAG 



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