FRESH WATER ALG/t. 



PLATE XIII 



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AFTCR NATURE Or DR.M.CWOOO, 



eUASTRUM RALFSM 

 eUASTRUM ELEGANS. 

 EUASTRUM BINALE 

 ■' CRAST. DISPUTA 

 CRAST. FURCATA 



SrAURASIRUM MUNl'UM, 

 COSMARIUM PYRAMIDATUM 

 COSMARIUM BROOMEI. 

 COSMARIUM COMMISSURALE 



