X LIST OF PLATES. 



PLATE IV. 



Fig. Page 



1. Laurencia pinnatifida ...... 129 



2. Chylocladia articulata 141 



3. CoraUina officinalis 146 



4. Chondrus erispus 203 



PLATE V. 



1. Hypnea purpurascens (with tubercles) . . 187 



2. Ptilota sericea 240 



3. P^lysiphonia fastigiata 114 



4. Giiffithsia corallina ...... 259 



PLATE VI. 



1. Ceramium rubrum 243 



2. Callith amnion tetragonum 267 



3. Cladophora rupestris 295 



4. Enteromorpha compressa 315 



