EXPLANATIONS AND REFERENCES, 

 PLATE CXCVI. 



Figures magnified 250 diameters. 



PAGE. 

 Fig. 1. HAPALOSIPHON BREBISSONII, from specimens, Dennisville, N.J., 276 



" 2-4. HAPALOSIPHON BRAITNII. parts of three filaments with branches 



shortened, . . . 275 



5. small section, more highly magnified 



10 show the process of transverse divi- 

 sion of cells. As they enlarge they 

 glide out of the filament, and then 

 continue growth, . . . 276 



'* 6 producing encysted cells, . 276 



Figs. 7, 8. From these last Chroococcns cells are developed, also the follow- 

 ing four, ...... 276 



" 9, 10. Paimagloea cells, (Mesotaenium), see Desmids U. 8.. . . 276 



Fig. 11-15. Noslochopsis (Wood) forms, . . . . .276 



Figs. 16, 17. Nostocs, . . . . . . . .276 



Fig. 18 Hormosiphon, . . . . . . .276 



19 A specimen developing secondary branchlets, . . . 276 



Figs. 20, 21. HAPALOSIPHON TENUISSIMUS, not infrequent, ponds, New Jersey, 



Pennsylvania, Minnesota, Florida, 277 

 " 22, '23. HAPALOSIPHON FUSOESCENS, pond waters, New Jersey, . 277 



