CONTENTS, 



CHAPTER PAGE 



I. INTRODUCTORY i 



II. CHALK-MAKERS, OR FORAMINIFERA 27 



III. LATTICE-WORKERS, OR POLYCYSTINA 66 



IV. SPONGE WEAVERS 109 



V. PLANT- ANIMALS, OR ZOOPHYTES 145 



VI. SEA-FAN MAKERS 180 



VII. CORAL BUILDERS 215 



VIII. CORAL REEFS, AND ISLANDS 247 



IX. SEA-MAT MAKERS 291 



X. TUBE-MASONS 314 



XI. EXCAVATORS 340 



