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 180 



SPECIAL ZOOLOGY 182 



Phylum I. Protozoa 183 



Class I. Rhizopoda 1S7 



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. Autotlagellata 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 21^ 



Order I. Gregarinida 21 ; 



Order II. Coccidiae 21s 



Order III. Haemosporida 216 



Order IV. Myxosporida 21- 



Order V. Sarcosporida 218 



Summary 2 1 8 



Metazoa 221 



Phylum 11. Porifera 221 



Order I. Calcispongise 2's 



Order II. Silicispongiae -,2^^ 



Summary ,,_ 



Phylum. III. CcElEnTERATA ^^g 



Class I. Hydrozoa ,^0 



Order I. Hydraria ,40 



Order II. Hydrocorallinie , , j 



Order III. Tubularia; = Anthomedusx -> 4 1 



Order IV. Campanulariae = Leptomedusa^ 242 



Order V. Trachomedusa? -,, ., 



Order VI. Narcomedusse -, , ^ 



Order VII. vSiphonophora -, . , 



