THE EUPLECTELLA 



69 



these attractive forms of life existed in the past on 

 ocean floors that now form elevated tracts of country 

 far removed from the sea. 



Fig. 13. Sponge Spicules (see Fig. 58). Very greatly magnified. 



The department of sponge life that we have had 

 under consideration, whether as regards its living 

 forms or fossilized representatives of ancient geologi- 



