CONTENTS. 



ANATOMY OF SPECIAL FORMS 



TLtl)ularia iiidivisa 

 Coryiiiorpha nutans 

 Clavatella prolifera 

 Cladonemu ladiatum 

 Ilydractinia echinata 

 Gemmaria implexa 

 Dicoryne conferta 



PAGi: 

 205 



205 

 -'05 

 •212 

 210 

 220 

 223 

 220 



SUPPLEMENTARY NOTE. 

 STRUCTURE OF CORDYLOPHORA 

 THE GONANGIUM .... 

 FUNCTION OF THREAD-CELLS 

 EVOLUTION OF THE HYDROIDA 



228 

 229 

 220 

 230 



PART II. 



THE GENEEA AND SPECIES OF THE GYMNOBLASTEA. 

 GENERAL PRINCIPLES OF HYDROID ZOOGRAPHY 

 SYNOPSIS OF FAMILIES AND GENERA 



235 

 239 



DESCRIPTIONS OF THE FAMILIES, GENERA, 

 CLAVID^ ..... 

 TURRID.E .... 



CORYNID^ .... 



SYNCORYNIDiE .... 



AND SPECIES. 



242 

 259 

 264 

 274 



