ILLUSTRATIONS. 



Plate I. A Philippine commercial sponge in its natural state. 

 II. The Philippine Sheep's-Wool Sponge. 

 III. The Philippine Zomoeoa Sponge. 

 IV. Philippine Rock Sponge. 

 V. The Philippine Reef Sponge. 

 "VT. The Philippine Grass Sponge. 

 VII. The Sulu Sea Bath Sponge. 

 VIII. The Philippine Elephant's-Ear Sponge. 

 IX. The Tube Sponge. 

 Fig. 1. (In the text.) The Byersdoffer floating corral. 



2. (In the text.) The Byersdofl'er paddle. 



3. (In the text.) The ByersdofTer sponge washboard. 



4. (In the text.) Sponges planted on copper wire. 

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