SECTION VII. CLASSIFICATION OF ANIMALS AND PLANTS 227 Protozoa 229 Porifera 230 Cœlenterata 230 Echinodermata 231 Vermes 232 Arthropoda 233 Mollusca 233 Vertebrata 234 Tunicata 234 Leptocardii 235 Marsipobranchii 235 Pisces 236 Amphibia 237 Reptilia 238 Aves 238 Mammalia 239 Primates 239 Lemuroidea 240 Anthropoidea 241 Hapalidæ 242 Cebidæ 242 Cercopithecidæ 242 Simiidæ 243 Hominidæ 243 Flowerless Plants 244 Flowering Plants 244 SECTION VIII. WORKS OF REFERENCE 247 SECTION IX. GLOSSARY 255 SECTION X. INDEX 277 ILLUSTRATIONS. FIG. PAGE 1. Diagram of a Cell. (_Drawn by Mr. E. P. Copeland from a sketch by the Author._) 5 2. Stylonychia. (_Drawn by Mr. E. P. Copeland._) 9 3. Amœba. (_Drawn by Mr. E. P. Copeland._) 11 4. Rotalia. (_Drawn by Dr. A. L. Lawrence._) 12 5. Difflugia. (_Drawn by Dr. A. L. Lawrence._) 17 6. Noctiluca. (_Drawn by Dr. A. L. Lawrence._) 18 7. Gromia. (_Drawn by Dr. A. L. Lawrence._) 21 8. Diagram Illustrating Mitosis. (_Drawn by Mr. E. P. Copeland from a sketch by the Author._) 26 9. Diagram Illustrating the Maturation and Fertilization of the Ovum. (_Drawn by Mr. E. P. Copeland from a sketch by the Author._) 30