XIT SYSTEMATIC INDEX. 



Eamilia Desmacidonidje (continued). 



Page 



Genus Clathrissa 217 



Echinonema 219 



Clathria 221 



Thalassodendron 222 



Plectispa 225 



Clathriopsamma 227 



Familia Aulenid^ 227 



Genus Aulena 228 



HyatteUa 233 



Familia Axinellid^ 234 



Genus Axinella 234 



SpirophoreUa 236 



Key to the Genera 239 



Gbnebal Index 251 



