viii ZOOLOGY 
CHAPTER xX 
CHAETOPODA 
CHAPTER XI 
GEPHYREA 
CHAPTER XII 
BRACHIOPODA 
CHAPTER XIII 
POLYZOA 
CHAPTER XIV 
Mo.uusca 
CHAPTER XV 
ECHINODERMATA 
CHAPTER XVI 
ARTHROPODA—-CRUSTACEA 
CHAPTER XVII 
PROTOTRACHEATA 
CHAPTER XVIII 
MYRIAPODA 
CHAPTER XIX 
INSECTA 
CHAPTER XX 
ARACHNIDA 
CHAPTER XxXI 
CHORDATA 
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310 
321 
388 
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