Contents xv 



PAGE 



Family 4. Oscillatoriacese 329 



Sub-family I. VAGINARIE^E 330 



Schizothrix, Dasyglcea, Microcoleus 



Sub-family T [. LYNGBY^E 332 



Plectonema, Symploca, Lyngbya, Phormidium, Oscil- 

 latoria, Arthrospira, Spirulina 



Sub-order 2. TRICHOPHORE.E . .337 

 Family 1. Rivulariaceae 337 



Amphithrix, Calothrix, Dichothrix, Rivularia, Gloeo- 

 trichia 



Family 2. Camptotrichacese 341 



Ammatoidea 



Order II. COCCOGONE.E 342 



Family 1. Chamaesiphoniacese 342 



Chamaesiplion 



Family 2. Chroococcaceae 343 



Sub-family I. CHROOCYSTE^E ..... 344 



Gkeochtete 



Sub-family II. CHROOCOCCE.E 345 



Gloeothece, Aphanothece, Synechococcus, Dactylococ- 

 copsis, Merismopedia, Tetrapedia, Coelospheeriurn, 

 Gomphosphseria, Microcystis, Gloeocapsa, Aphano- 

 capsa, Porphyridium, Chroococcus 



INDEX . . 353 



Plankton from Lough Neagh and Loch Ruar .... Frontispiece 



