DIATOMEES 



83 



Plankton 



Antarc- 

 tiques 



1 2 3 



Arctiques 



5 6 



Banquise, Glace fondue 



[0 



Arctiques 



11 12 13 14 15 16 17 18 



Sondages 

 récoltes littorales 



Antarctiques 



19 20 21 22 23 24 



Antiques 



25 26 27 



Asteromphalus (suite) 



A. reticulatus Cleve . . 

 A. Roperianus Ralfs . 



.4. W'yville-Thomsonianus O'Mea. 



Pyxidicula 



P. dentata Eh. . 

 P. radiata O'Mea. 



Xanthiopyxis 



X. polaris Grun. 



Schimperiella 



+ 



+ 



+ 



+ 



+ 



+ 



S. antarctica Karst. 

 S. Valdiviae Karst. 



Stephanodiscus 



S. Hantzschianus Grun. . 

 » var. pusilla 



S. miiuttiihts Grun. 



+ 



Actinocyclus 



.4. aliénas Grun. 



» var. arctica 



A. antarcticus Karst. . 

 A. bifrons (Cast.) Karst. 

 .1. Challengerensis O'Mea 

 A. corona Karst. 

 .4. Ehrenbergii Pritch. 

 ,4. interniittens Karst. 

 A. Janus (Cast.l Karst. 

 .4. moniliformis Pritch. 

 .4. Oliveranus O'Mea. . 

 .4. pumilus Cast. 

 A. Pialfsii W. Sm. . . 



» var. sparsa. 



A. similis Karst. . 

 .4. subocellatus Ratt. . 

 .4. subtilis Grun. 

 A . umbonatus Cast. 

 .4. Valdiviae Karst. 



Coscinodiscus 



C. actinochylus Eh. 



C. adumbratus Oest. . 



C. africanus v. Wallichiana 



C angustelineatus A. Sch. 



('.. antarcticus Cast. 



C. antarcticus Grun. . 



C. Apollinis Eli. ... 



C. Asteromphalus Eh. . 



» var. hybrida 



» var. omphalautltus 



C. asymetricus Grun. . 



C. atlanticus Cast. . 



C. australis Karst. . . 



C. balticus Grun. 



C. bathyomphalus Eh. 



C. bifrons Cast. . 



C. bioculatus Grun. 



» var. exigua 



C. Bouvet Karst. 



C. Castracanet Karst. . 



C. caudatus Karst. . 



C. centralis Eh. 



» var. micraste, 



C. chromatorailiatus Karst. 



C. C/iunii Karst. 



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4- 



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I 



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