CONTENTS 



Part II 

 CHAPTER I 



PAGIS 

 AMCEBA — UNICELLULAR AND MULTICELLULAR ANIMALS . . 229 



PRACTICAL DIRECTIONS . . . ... 238 



CHAPTER 11 



H^MATOCOCCUS AND EUGLENA — MONADS AND BACTERIA— DIF- 

 FERENCES BETWEEN ANIMALS AND TLANl'S — SAPROPHYTES 24O 

 PRACTICAL DIRECTIONS ... ... 259 



CHAPTER HI 



PARAMCECIUM, OPALINA, VORTICELLA AND ITS ALLIES — PARA- 

 SITIC AND COLONIAL ORGANISMS — BIOGENESIS AND ABIO- 

 GENESIS — CLASSIFICATION OF THE UNICELLULAR ORGAN- 

 ISMS EXAMINED . . . 261 



PRACTICAL DIRECTIONS . . . 286 



CHAPTER jy 



HYDRA : BOUGAINVILLEA — ALTERNATION OF GENERATIONS — 



CHARACTERS OF THE PHYLUM CCELENTERATA .... 289 



PRACTICAL DIRECTIONS . . . . 314 



CHAPTER V 



THE EARTHWORM— CHARACTERS OF THE PHYLUM ANNULATA 318 

 PRACTICAL DIRECTIONS . . . . ■ . ... 34I 



CHAPTER VI 



THE CRAYFISH — CHARACTERS OF THE PHYLUM ARTHROPODA . 346 

 PRACTICAL DIRECTIONS ... 372 



CHAPTER VH 



THE FRESH-WATER MUSSEL — CHARACTERS OF THE PHYLUM 

 MOLLUSCA — ENUMERATION OF THE CHIEF PHYLA OF THE 



ANIMAL KINGDOM 381 



PRACTICAL DIRECTIONS ... . . . . ... 397 



