110 SPECIES OF DESMIDS. 



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



fur cat um, 150 



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



than long duplex, 149 



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



angles, 9, senartam, 147 



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



spongiosum, 148 



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



calyxoides* 



*F. w. Algae, p. 46. 



