PLATE XXV. 



Figure 1. Fragilaria (?) (an Terebraria (?) ), sp. (?) 



2. Terebraria (?), sp. (?) . 



3. Cyclophora tenuis, Cstr., var. no v. 



4. Hemiaulus glacialis, n. sp. 



5. Isthmia enervis, Ehrenb., var. japonica, nov. . 



6. Asterionella gracillima (Hantzsch.), Heib. 



7. Triceratium insutum, n. sp. . 



8. Molleria cornuta, Cleve. 

 Figures 9 and 10. Bacillaria socialis, Greg., var. indica, nov. 

 Figure 11. Fragilaria linearis, n. sp., et Fragilaria, sp. (?) 



12. Fragilaria antarctica, n. sp. 



13. Synedra capitulata, n. sp. 



14. Synedra Jimbriata, n. sp. . 



15. Synedra philippinarum, n. sp.. 



16. Synedra atlantica, n. sp. . 



17. Fragilaria, sp. . 



18. Synedra lanceolata, n. sp., var. thaitiensis, nov. 



19. Gephyria, n. sp. (?) . 



20. Synedra lanceolata, n. sp. 



21. Fragilaria (?) 



The determination of this form is somewhat doubtful, and its detailed descrip 

 tion has been omitted from the text. 



,, 22. Diatoma rhombicum, O'Me. . 



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