qj7 



and the Malay Arcliip. |). 24 ; Sijnedra Thalassiofhrix Cleve, Bill. K. Sv. 

 Vet. Akad. Handl. 1, iNr. 13, p. 22, PI. 4, f. 24; Synedra sp., Chun, Aus 

 den Tiefen des Weltmeeres, Jena 1900, p. 206, f. 2, 3. 



Most of the present specimens are very delicate (f. gracilis Ostf.), 

 but also the main species has been met with. 



2 (rr) — 4 (rr) - 6 (r) - 7 (rr) - 10 (-^). 



Area: Arctic and Northern Atlantic Ocean (especially in the iriuin!4er Sea), 

 Antarctic Ocean from 20° W. to 91° E., Red Sea, Gulf of Aden, Indian Ocean 

 from c. 40- S. to 45° S., Malay Archipelago, Bering Sea. It is a l)ipolar species 

 which often predominates in the samples from the Sul)arctic regions. 



Naviculeae. 



Navicula Bory. 



76. N. membraaacea Cleve, Phytoplankton 1897, 

 p. 24, PI. II, f. 25-28 ; PI. f. the Red Sea p. 1033 ; 

 Atl. Plankt. Organisms p. 333; PI. f. the Indian Sea 

 and the Malay Archipelago p. 22 ; Lemmermann 1. c. 

 p 315. 



As supplement to the figures by Cleve (Phyto- 

 plankton) I have given two figures of a frustule in 

 valvular and in zonal view. No structure visible. 



2(rr) — 3(rr) — 6 (rr) — 10 (rr). 



Area: Subtropical Atlantic Ocean (rare), Bed Sea, Malay Archipelago, Cook 

 Strasse at New Zealand. 



L 



Fig. 2.3. Naricida 



nienibranacea CI. 



Side view and front 



view 



, (MO). 



Nitzschieae. 



Nitzschia Hass. 



77. N. seriata Cleve, Dial, of Vega, Vega-exped. velensk. iakttagelser 

 PI. 38, f. 75; Atl. Plankt. Organisms p. 335; N. fraudtdenta Cleve, Fish. 

 Board f. Scotland 1896, p. 300, PI. 1, f. 11; PI. f. the Indian Ocean and 

 the Malay Archip. p. 22 ; Schroder, Neapel \). 32. 



1 (rr) - 2 (rr) - (i (rr) — 10 (rr). 



Area: Arctic Ocean, Northern Atlantic Ocean southwards to Azores, Me- 

 diterranean, Malay Archipelago. 



4 _ 8 — 1902. 



