Plate XVIII; Figures 106 to 108; Fig. 107 Magnified 

 1000 Diameters ; others 500 Diameters. 



Fig. 106. Micrasterias radiosd (Ag.) Ralfs 



var. punctata West . . . page 63, 

 Fig. 107. Micrasterias Criix-Mclitcnsis (Ehrb. ) 



Ha Li. 



ass. ...... 



Fig. 108. Micrasterias apiculata Alenegh. 



