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Family 2. Volvocacese 184 



Sub-family I. CHLAMYDOMONADE/E 186 



Carteria, Chlamydomonas, Chlorogonium, Sphserella 



Sub-family II. PHACOTE^E 189 



Phacotus 



Sub-family III. VOLVOCE^E 190 



Goniurn, Stephanosphsera, Pandorina, Eudorina, Volvox 



Family 3. Endosphaeracese . . . 197 



Chlorochytrium, Centrosphoera, Phyllobium 



Family 4. Characieae ... 199 



Characium 



Family 5. Pleurococcaceae . . . 201 



Pleurococcus, Trochiscia, Radiococcus, Protoderrna, Hor- 

 motila, Urococcus 



Family 6. Hydrodictyaceae . . 206 



Sub-family I. HYDRODICTYE^E .... 207 



Hydrodictyon 



Sub-family II. PEDIASTRE.E . . 209 



Pediastrum, Euastropsis 



Family 7. Protococcaceae (or Autosporacese) . 212 



Sub-family I. CCELASTRE^ . . . 213 



Coelastrum, Sorastrum 



Sub-family II. CRUCIGENIE^E . 215 



Crucigenia, Tetrastrum 



Sub-family III. SELENASTRE.E .... 217 



Dactylococcus, Scenedesmus, Dimorphococcus, Ankistro- 

 desmus, Closteriopsis, Actinastrum, Selenastruni, 

 Kirchneriella 



Subfamily IV. OOCYSTIDE/E .... 226 



Oocystis, Nephrocytium, Eremosphsera, Palmellococcus, 

 Chlorella 



Sub-family V. TETRAE'DRIE^E . . 231 



Tetracdron, Cerasterias 



Subfamily VI. PHYTHELIE.-E . . . 232 



Golenkinia, Eichteriella, Lagerheimia, Chodatella 



Sub-family VII. DiCTYOsrHjERiEJE . . 235 



Dictyosphoerium, Dictyocystis, Tetracoccus, Botryococ- 

 cus, Ineffigiata 



