vi TABLE OF CONTENTS. 



PAGE 



Cleavage Processes 151 



Formation of the Germ Layers 156 



Different Forms of Sexual Development 160 



Summary 162 



RELATION OF ANIMALS TO ONE ANOTHER 164 



Relations between Individuals of the Same Species 164 



Relations between Individuals of Different Species 167 



ANIMAL AND PLANT 171 



GEOGRAPHICAL DISTRIBUTION OF ANIMALS 174 



DISTRIBUTION OF ANIMALS IN TIME 1 80 



SPECIAL ZOOLOGY 182 



Phylum I. PROTOZOA 183 



Class I. Rhizopoda 187 



Order I. Monera 189 



Order II. Lobosa 189 



Order III. Heliozoa 190 



Order IV. Radiolaria 192 



Order V. Foraminifera 196 



Order VI. Mycetozoa '. 198 



Class II. Flagellata 200 



Order I. Autoflagellata 200 



Order II. Dinoflagellata 203 



Order III. Cystoflagellata 203 



Class III. Ciliata 204 



Order I. Holotricha 209 



Order II. Heterotricha 209 



Order III. Peritricha 210 



Order IV. Hypotricha 211 



Order V. Suctoria 212 



Class IV. Sporozoa 213 



Order I. Gregarinida 213 



Order II. Coccidiae 215 



Order III. Haemosporida 216 



Order IV. Myxosporida 217 



Order V. Sarcosporida 218 



SUMMARY 218 



METAZOA 221 



Phylum II. PORIFERA 221 



Order I. Calcispongiae 225 



Order II. Silicispongiae 226 



SUMMARY 227 



Phylum III. CcELENTERATA 228 



Class I. Hydrozoa 230 



Order I. Hydraria 240 



Order II. Hydrocorallinae 241 



Order III. Tubulariae = Anthomedusae 241 



Order IV. Campanulariae = Leptomedusae 242 



Order V. Trachomedusae 242 



Order VI. Narcomedusae 242 



Order VII. Siphonophora 243 



