CONTENTS 



Introduction page 225 



General 226 



Systematic 228 



Scalpellum gibberum 228 



Scalpellum liberum, n.sp 233 



Scalpellum magnae-carinae , n.sp. 236 



Scalpellum angulare, n.sp 239 



Scalpellum africanum 242 



Scalpellum convexum 244 



Lepas anatjfera var. a 247 



Lepas australis 247 



Conchoderma auritum . . ' 249 



Conchoderma virgatum 251 



Hexelasma corolliforme 252 



Balanus maxillaris 254 



Balanus laevis 254 



Elminius kingi 255 



Coronula diadema 256 



Coronula reginae 256 



Xenobalanus globicipitis 258 



Literature 259 



Plate I following page 260 



