no SPECIES OF DESMIDS. 



E. Processes shorter than semi-cell diameter, ends furcate, 



furcatuva, 150 

 E. Processes 6, short, notched; semi-cell rectangular, twice wider 



than long , . . . . duplex, 149 



E. End view central radiating processes 6; marginal, including 



angles, 9, . . . . senariam, 147 



E. " central and marginal spines short, numerous, notched,. 



spongiosum, 14& 

 G. Semi-cells saucer-shaped, margin with 5 divergent spines, 



calyxoides .*" 



*F. — w. Algfe, p. 46. 



