16 EXPLANATION OF THE PLATES. 



PLATE LXX. 



Fig. 1. Microcoleus repens. Fig. 2. Microcoleus gracilis. 

 Fig. 3. Microcoleus anguiformis. Fig. 4. Oscillatoria 

 cinerea. Fig. 5. Oscillatoria pulchella. 



PLATE LXXI. 



Fig. 1. Oscillatoria mucosa. Fig. 2. Oscillatoria limosa. 

 Fig. 3. Oscillatoria nigra. Figs. 4. 6. and 7. Oscillatoria 

 contexta. Fig. 8. Oscillatoria Carmichaeli. Fig. 5. 

 Oscillatoria spadicea. Fig. 9. Oscillatoria virescens. 

 Fig 10. Oscillatoria decorticans corticola. 



PLATE LXXII. 



Fig. 1. Oscillatoria tennis. Fig. 2. Oscillatoria cerugescens. 

 Fig. 3. Oscillatoria thermalis. Fig. 4. Oscillatoria tere- 

 briformis. Fig. 5. Oscillatoria spadicea. Fig. 6. Oscil- 

 latoria turfosa. Fig. 7. Oscillatoria autumnalis. Fig. 8. 

 Oscillatoria splendida. Fig. 9. Oscillatoria subfusca. 

 Fig. 10. Oscillatoria violacea. Fig. 11. Oscillatoria ru- 

 pestris. Fig. 12. Oscillatoria muscorum. Fig. 13. Oscil- 

 latoria Dickiei. Fig. 14. Lyngbya copulata. 



PLATE LXXIII. 



Fig. 1. Nostoc macrosporum. Fig. 2. Filaments of the same 

 dividing themselves into separate portions, each of which 

 forms a distinct individual. 



PLATE LXXIV. 



Fig. 1. Nostoc caruleum. Fig. 2. Nostoc commune. Fig. 3. 

 Nostoc ? variegatum. Fig. 4. Nostoc muscorum. 



PLATE LXXV. 



Fig. 1. Trichormus incurvus ? Fig. 2. Anabaina flos- 

 aqua. Fig. 3. Anabaina impalpebralis ? Fig. 4. Ana- 

 baina licheniformis ? Fig. 5. Spirillum Jenneri. Fig. 6. 

 Spirillum rupestre. Fig. 7. Spirillum Thompsoni. Fig. 8. 



