Contents xiii 



PAGE 



Family 8. Palmellaceae 239 



Sub-family I. PALMELLE^E . . . . . 240 



Palmella, Palmodactylon, Schizochlamys, Sphserocystis 



Sub-family II. TETRASPORE^E 243 



Tetraspora, Apiocystis 



Sub-family III. GL(EOCYSTIDE,E 244 



Glceocystis, Dactylothece, Palmodictyon, Botrydina 



Class 4. HETEROKONT.E, p. 248. 



Order I. CONFERVALES 249 



Family 1. Chlorotlieciaceae 250 



Stipitococcus, Characiopsis, Miscbococcus, Oodesmus 



Family 2. Tribonemaceae 253 



Cblorobotrys, Ophiocytium, Tribonema, Bumilleria 



Family 3. Botrydiaceae 258 



Botrydium 



Class 5. BACILLARIE^E, p. 260. 



Order I. CENTRIC^ 273 



Sub-order 1. DISCOIDE.E .274 



Family 1. Melosiracese 274 



Melosira 

 Family 2. Coscinodiscaceae 276 



Cyclotella, Stephanodiscus, Coscinodiscus 



Sub-order 2. SOLENOIDE^E 277 



Family 1. Rhizosoleniaceae 278 



Rbizosolenia, Cylindrotheca 



Order II. PENNATJ5 279 



Sub-order 1. FRAGILARIOIDE^ 280 



Family 1. Tabellariaceae . . . . . . 281 



Tetracyclus, Tabellaria, Diatomella, Denticula 

 Family 2. Meridionacea 283 



Meridion 

 Family 3. Diatomacese . 284 



Diatoma 

 Family 4. Fragilariaceae 285 



Fragilaria, Synedra, Asterionella 

 Family 5. Eunotiaceae 287 



Ceratoneis, Eunotia 



