Plate 59 



Figs. 1-3. Quadrigula Chodatii ( Tanner- Fullman ) G. M. Smith: 

 1, X 500 (redrawn from Smith); 2, x 590; 3, x 500 



Figs. 4, 5. Quadrigula lacustris (Chod.) G. M. Smith, x 500 

 ( after Smith ) 



Figs. 6, 7. Tetraedron armatum ( Reinsch ) DeToni, x 400 



Fig. 8. Tetraedron arthrodesmiforme (W. West) Wolszyn- 



ska, X 175 (redrawn from Tiffany) 



Figs. 9, 10. Tetraedron arthrodesmiforme var. contorta Woloszyn- 

 ska, X 1000 



Figs. 11-13. Tetraedron asijmnietricum Prescott, x 500 



Fig. 14. Tetraedron bifurcatum ( Wille) Lagerheim, x 500 



Figs. 15, 16. Tetraedron bifurcatum var. minor Prescott: 15, x 500; 

 16, X 750 



Fig. 17. Tetraedron caudatum ( Corda ) Hansgirg, x 200 



Fig. 18. Tetraedron enorme var. pentaedricum Prescott, x 650 



Fig. 19. Tetraedron enorme ( Ralfs ) Hansgirg, x 650 



Figs. 20-22. Tetraedron caudatum var. longispinum Lemmermann, 

 X 1000 (redrawn from Smith) 



Fig. 23. Tetraedron cruciatum var. reductum Prescott, x 600 



Figs. 24, 25. Tetraedron caudatum ( Corda ) Hansgirg, x 1000 ( af- 

 ter Smith ) 



Fig. 26. Tetraedron hastatum ( Reinsch ) Hansgirg, x 100 (after 



Smith ) 



Fig. 27. Tetraedron hastatum var. palatinum (Schmidle) Lem- 



mermann, X 1000 (after Smith) 



Fig. 28. Tetraedron constrictum G. M. Smith, x 1000 (after 



Smith) 



[778 ] 



