vm CONTENTS. 



PAOE 



Butterfly 90 



Comparisons 91 



Earthworm 92 



Comparisons 96 



Clam 98 



Oyster 102 



Squid 103 



Comparisons 108 



Starfish 110 



Sea-urchin 115 



Comparisons 118 



Sea-anemone 120 



Hydroid (Pennaria) 123 



Hydroid (Clava) 125 



Hydroid Medusa 127 



Comparisons 128 



Sponges 130 



Amoeba 132 



Paramsecium 134 



Comparisons 136 



SYSTEMATIC ZOOLOGY. 



THE ANIMAL KINGDOM 137 



PROTOZOA 145 



Rhizopoda 147 



Infusoria 149 



Sporozoa 151 



Summary 152 



METAZOA 154 



Summary 157 



Spongida 158 



Summary 161 



Coelenterata 162 



Hydrozoa 165 



Scyphozoa 169 



Ctenophora 174 



Summary 176 



