Plate 64 



Fig. 1. Sccnedesmus longus var. Naegelii (de Breb.) G. M. 



Smith, X 750 ( after Smith ) 



Fig. 2. Scenedesmus quadricauda (Tuip.) de Brebisson, > 750 



Figs. 3, 4. Scenedesmus quadricauda var. maximus West & West, 

 x500 (after Smith) 



Fig. 5. Actinastrum gracilimum G. M. Smith, x 750 (after 



Smith) 



Fig. 6. Scenedesmus quadricauda var. parvus G. M. Smith, x 



750 (after Smith) 



Fig. 7. Scenedesmus quadricauda var. Westii G. M. Smith, x 



750 



Fig. 8. Scenedesmus serratus (Corda) Bohhn, x 750 ( redrawn 



from Bohhn, ex Brunnthaler ) 



Fig. 9. Scenedesmus quadricauda var. Westii G. M. Smith, x 



1000 (after Smith) 



Figs. 10, 11. Actinastrum Hantzschii Lagerheim; 10, x 1000; 11, x 

 500 (after Smith) 



Figs. 12-14. Tetradesmus wisconsinense G. M. Smith: 12, x 750; 

 13, x 1000; 14, X 750 (after Smith) 



Figs. 15-17. Tetradesmus Smithii Prescott: 15, x 500; 16, x 750; 17, 

 xl250 



[788] 



