CONTENTS xiii 



Type XII 



PACK 



VAVCHERIA . . . . . . .174 



1. Structure . . . . . .175 



2. Reproduction . . . . , .176 



Type XIII 

 PLEUROCOCCUS VULOARIS . . . . . .182 



B. THE PH^EOPHYCEJS 



Type XIV 



ECTOCARPUS SILICULOSUS 



1. Structure . . . . . .185 



2. Reproduction . . . . . .185 



Type XV 



PKLVETIA CANALICULATA . . . . . .189 



1. Structure . . . . . .190 



2. Reproduction . . . . . .194 



G. THE FLORIDEvE . . 201 



Type XVI 



CALLITHAMNION CORYMBOSUM 



1. Structure . . . . . .202 



2. Reproduction 



a. Asexual ...... 204 



b. Sexual . . . . . .206 



D. THE CYANOPHYCE.E 



Type XVII 



NOSTOC . 212 



