FRESH WATER ALG/t. 



PLATE XIII. 



1 s ttv on M C WOOD. 



Fig. 1. EUASTRUM RALFSli, 



" 2. EUASTRUM ELEGANS, 



" », EUASTRUM BINALE 



" 4, MICRAST OISPUTA. 



■ 5. MICRAST. FURCATA. 



IBID VARIETY DENTICOLATA. 

 M. JENNERM. 



STAURASTRUM ORBICULARE 

 STAURASTPUM DEJECTUM. 



blAURASTRUM MUNITUM. 

 COSMARIUM PYRAMIDATUM 

 COSMARIUM BROOMEI 

 COSMARIUM COMMISSURAL 

 XANTHIDIUM liRMATUM 



i 



