xiv CONTENTS 



SECTION VII 



PAGE 



PHYLUM ECHINODERMATA 157 



Class i. The Asteroidea 157 



Example of the Class Asterias vulgaris . . '157 

 Class 2. The Ophiuroidea 169 



Example of the Class Ophioglypha lacertosa . .169 

 Class 3. The Echinoidea 170 



Example of the Class Strongylocentrotus . . . 1 70 

 Class 4. The Holothuroidea 1 73 



Example of the Class Holothuria ednlis . . . 1 73 

 Class 5. The Crinoidea 174 



Example of the Class Ante don 174 



SECTION VIII 



ROTIFERA, POLYZOA, AND BRACHIOPODA 178 



Class i. Rotifera 178 



Example of the Class Brachionus rubens , . .178 

 Class 2. Polyzoa 181 



Example of the Class Bugula avicularia . . .181 

 Class 3. Brachiopoda 184 



Example of the Class Magellania flavescens . . .184 



SECTION IX 



PHYLUM ANNULATA 188 



Class i. The Chaetopoda 188 



Example of the Class Nereis dumerilii . . . .189 



Class 2. The Hirudinea 203 



Example of the Class Hirudo medicinalis . . . 203 



SECTION X 



PHYLUM ARTHROPODA 212 



Class i. The Crustacea 213 



Example of the Class Astacus fluviatilis . . . 213 



Class 2. The Onychophora 236 



Example of the Class Peripatus 236 



