Contents xv 



PAGE 



Family 4. Oscillatoriacese 329 



Sub-family I. VAGINARIE.E 330 



Schizothrix, Dasyglcea, Microcoleus 



Sub-family IT. LYNGBYE^E 332 



Plectonema, Symploca, Lyngbya, Phormidium, Oscil- 

 latoria, Arthrospira, Spirulina 



Sub-order 2. TRICHOPHORE^ 337 



Family 1. Rivulariaceae 337 



Amphithrix, Calothrix, Dichothrix, Rivularia, Gloeo- 

 trichia 



Family 2. Camptotrichaceae 341 



Amrnatoidea 



Order II. COCCOGONEJE 342 



Family 1. Chamaesiphoniacese . . . . . . 342 



Chamaesiphon 



Family 2. Chroococcaceae 343 



Sub-family I. CHROOCYSTE^E 344 



Gloeochsete 



Sub-family II. CHROOCOCCE^E 345 



Glceothece, Aphanothece, Synechococcus, Dactylococ- 

 copsis, Merismopedia, Tetrapedia, Coslosphaerium, 

 Gomphosphseria, Microcystis, Gloeocapsa, Aphano- 

 capsa, Porphyridium, Chroococcus 



INDEX . 353 



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



