PLATE XX. 



Figures 1 and 3. Navicula brasiliensis, Grun. . 

 Figure 2. Navicula mammalis, n. sp. 



„ 4. Navicula subrhomboidea, n. sp. 



,, 5. Navicula thaitiana, n. sp. 



,, 6. Navicula, sp. (?) . 



Figures 7 and 11. Stauroneis oblonga, Bailey 

 Figure 8. Navicula oxeia, n. sp. 



,, 9. Stauroneis pacifica, n. sp. 



,, 10. Navicula entomon, Ehrenb., var. (?) 



,, 12. Navicula (?) jejuna, A. S. 



,, 12 fo's. Alloioneis japonica, n. sp. . 



,, 13. Stauroneis salina, W. Sm., var. c, nov. 



„ 14. Alloioneis antillarum, CI. et Grun., var. nov. 

 „ 15. Achnanthes kerguelenensis, n. sp. 

 „ 16. Stauroneis thaitiana, n. sp. 



,, 17. Navicula entomon, Ehrenb., var. thaitiana, nov. 



„ 18. Gephyria (?) sp. .... 



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30 

 30 

 30 

 27 

 34 

 24 

 31 

 23 

 28 

 33 

 36 

 23 



35 



41 

 23 



28 



42 



This is the same form as figured on Plate XXV. fig. 19. 



