CONTENTS. XI 



Descriptions of genera and species — Continued. 

 Suborder Balanomorpha — Continued. 



Family Chthamalidae — Continued. page. 



Genus Chthamalus imperatrix 320 



Chthamalus cirratus 321 



Chthamalus scabrosus 323 



Chthamalus intertextus 324 



Chthamalus hembeli 324 



Genus Pachylasma 327 



Pachylasma giganteum 329 



Pachylasma darwinianum 329 



Pachylasma chinense 329 



Pachylasma crinoidophilum 329 



Genus Hexelasma 329 



Hexelasma americanum 330 



Hexelasma callistoderma 332 



Genus Octomeris 334 



Octomeris angulosa 334 



Genus Catophragmus 334 



Catopliragmus imbricatus '. 335 



Catophragmus darwini 33& 



Catophragmus polymerus 336 



Appendix 337 



Explanation of plates 339 



Index 359 



