Plate 56 



Figs. 1-3. Franceia Droescheri (Lemm.) G. M. Smith, x 900 (re- 

 drawn from Smith ) 



Fig. 4. Franceia ovalis (France) Lemmermann, x 1000 (re- 



drawn from Smith ) 



Figs. 5, 6. Ankistrodesmiis falcatus (Corda) Ralfs, x 500 



Fig. 7. Ankistrodcsmus fractus (West & West) Brunnthaler, 



x700 



Fig. 8. Cerasterias statirastroidcs West & West, x 590 



Fig. 9. Ankistrodesmiis falcatus var. tumidiis (West & West) 



G. S. West, x 1000 (after Smith) 



Fig. 10. Ankistrodesmus falcatus var. mirabilis ( West & West ) 



G. S. West, X 1000 (after Smith) 



Figs. 11, 12. Ankistrodesmus spiralis (Turner) Lemmermann, x 

 1000 (after Smith) 



Fig. 13. Dactylococcus infusionum NaegeH, x 735 (redrawn 



from Smith ) 



Figs. 14, 15. Ankistrodesmus falcatus var. stipitatus ( Chod. ) Lem- 

 mermann, X 590 



Fig. 16. Ankistrodesmus falcatus var. acicularis (A. Braun) G. 



S. West, X 1000 (redrawn from G. S. West) 



[772] 



