FRESH WATER ALG>t. 



PLATE IX. 



AFTER KATUne ftY DR M.C.WOOD. 



TSINCLAin aSON PHILADCLPHIA. 



Fig. 1. SIROSIPHON SCVTENEMATOIDES. I Fig. 2. SIROSIPHON LIGNICOLA. 



Fig 4-. STIGONEMA RAVENELLII. 



Fig. .% S. ARGILLACEA. 



