a7 945 
and the Malay Archip. p. 24; Synedra Thalassiothrix Cleve, Bih. K. Sv. 
Vet. Akad. Handl. 1, Nr. 13, p. 22, Pl. 4, £.24; Synedia 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, 
Q2(rr) — 4(rr) — 6(r} — 7 (rr) — 10(+). 
Area: Arctic and Northern Atlantic Ocean (especially in the Irminger Sea), 
Antarctic Ocean from 20° W. to 91° E., Red Sea, Gulf of Aden, Indian Ocean 
from c. 407 S. to 45°S., Malay Archipelago, Bering Sea. It is a bipolar species 
which often predominates in the samples from the Subarctic regions. 
Naviculeae. 
Navicula Bory. 
76. N. membranacea Cleve, Phytoplankton 1897, 
p. 24, Pl. Il, f. 95-28; Pl. f. the Red Sea p. 1033; 
Atl Plankt. Organisms p. 333; Pl. f. the Indian Sea 
and the Malay Archipelago p.22; Lemmermann lL. 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. 
(rr) — B(rr) — 6 (rr) — 10 (rr). 
Area: Subtropical Atlantic Ocean (rare), Red Sea, Malay Archipelago, Gook 
Strasse at New Zealand. 
Fig. 23, Navicula 
membranacea Cl. 
Side view and front 
view (722). 
Nitzschieae. 
Nitzschia Hass. 
77. N. seriata Cleve, Diat. of Vega, Vega-exped. vetensk. iakttagelser 
Pl. 38, f. 75; Atl. Plankt. Organisms p. 335; N. fraudulenta Cleve, Fish. 
Board f. Scotland 1896, p. 300, Pl. 1, f.11; Pl. f. the Indian Ocean and 
the Malay Archip. p. 22; Schréder, Neapel p. 32. 
1 (rr) — 2(rr) — 6(rr) — 10 (rr). 
Area: Arctic Ocean, Northern Atlantic Ocean southwards to Azores, Me- 
diterranean, Malay Archipelago. 
4 — 8 — 1902. 
