xii Contents 



PAGE 



Family 2. Volvocaceae 184 



Sub-family I. CHLAMYDOMONADE^E 186 



Carteria, Chlamydomonas, Chlorogonium, Sphaerella 



Sub-family II. PHACOTEA; 189 



Phacotus 



Sub-family III. VOLVOCE^E 190 



Gonium, Stephauosphsera, Pandorina, Eudorina, Volvox 



Family 3. Endosphaeraceae 197 



Chlorochytrium, Centrosphsera, Phyllobium 



Family 4. Characieae 199 



Characium 



Family 5. Pleurococcaceae . . . . . . . 201 



Pleurococcus, Trochiscia, Radiococcus, Protoderma, Hor- 

 motila, Urococcus 



Family 6. Hydrodictyacese 206 



Sub-family I. HYDRODICTYE^E 207 



Hydrodictyon 



Sub-family II. PEDIASTRE^E 209 



Pediastrum, Euastropsis 



Family 7. Protococcaceae (or Autosporaceae) . . . 212 



Sub-family I. CCELASTRE.E ' 213 



Coelastrum, Sorastrum 



Sub-family II. CRUCIGENIE^E 215 



Crucigenia, Tetrastrum 



Sub-family III. SELENASTRE^E 217 



Dactylococcus, Scenedesmus, Dimorphococcus, Ankistro- 

 desmus, Closteriopsis, Actinastrum, Selenastrum, 

 Kirchneriella 



Subfamily IV. OOCYSTIDE^E 226 



Oocystis, Nephrocytium, Eremosphsera, Palmellococcus, 

 Chlorella 



Sub-family V. TETRAEDRIE^E 231 



Tetraedron, Cerasterias 



Subfamily VI. PHYTHELIE^: 232 



Golenkiriia, Richteriella, Lagerheimia, Chodatella 



Sub-family VII. DICTYOSPH^ERIE^E 235 



Dictyosphaerium, Dictyocystis, Tetracoccus, Botryococ- 

 cus, Ineffigiata 



