ILLUSTRATIONS. 



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

 II. The Philippine Sheep's-Wool Sponge. 

 III. The Philippine Zomocca Sponge. 

 IV. Philippine Rook Sponge. 

 V. The Philippine Reef Sponge. 

 VI. 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 Byersdoffer paddle. 



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



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

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