Plate 62 



Fig. 1. Scenedesmus abundans var. brevicauda G. M. Smith, 



xlOOO (after Smith) 



Figs. 2, 3. Polyedriopsis spinidosa Schmidle, x 500 (after Smith) 



Figs. 4, 5. Scenedesmus abundans var. longicauda G. M. Smith, 

 xlOOO (after Smith) 



Figs. 6, 7, Scenedesmus acutiformis Schroeder, x 1000 



Fig. 8. Scenedesmus arcuatus Lemmermann, x 1000 



Fig. 9. Scenedesmus arcuatus var, capitatus G. M. Smith, x 



1000 (after Smith) 



Figs. 10-12. Scenedesmus arcuatus var. platijdisca G. M. Smith, x 

 1000 (after Smith) 



Figs. 13, 14. Scenedesmus armatus (Chod.) G, M. Smith, x 1000 

 (14, after Smith) 



Fig. 15. Scenedesmus armatus var. major G. M. Smith, x 500 



Fig. 16. Scenedesmus acuminatus (Lag.) Chodat, x 1000 (af- 



ter Smith ) 



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