PLATE XXVII. 



, 13. 



, 14. 



, 15. 



, 16. 



, 17. 



, 18. 



, 19. 



, 20. 



Amphora speciosa, n. sp. 



Amphora philippinica, n. sp. 



and 7. Navicula, sp. (?) 



Cymbclla pelagica, n. sp. 



Cymbella criophila, n. sp. 



Amphora staurophora,, n. sp. 



Amphora polyzonata, n. sp., var. nov. 



Stauroneis glacialis, n. sp., var. nov. . 



Navicula, sp. (?) 



Stauroneis glacialis, n. sp. 



Ceratoneis arcus, K.g.=Eunotia Arcus, W. Sm. 



The form here shown was found not unfrequently in the gathering from the 

 port of Tahiti. It approaches in its character the genus Amphora, and may 

 prohably belong to this genus. 



Cymbella marina, n. sp. 

 Amphora decora, n. sp. 

 Amphora thaitiana, n. sp. 

 Amphora meneghiniana, n. sp. 

 Navicula decipiens, n. sp. 

 Amphora polyzonata, n. sp. . 

 Amphora scalaris, n. sp. 

 Amphora oceanica, n. sp. 



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 19 

 35 

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21 

 20 

 18 

 25 

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 24 

 50 



21 



18 

 19 

 17 

 32 

 18 

 18 

 20 



