270 



90. N. Gastrum Ehr. var. exigua Greg., V. H. Syn. tab. VIII, 

 fig. 32. 



Kvalbo, Trangisvaag (S 3^ de ro). 



91. N. Placentula Ehr., V. H. Syn. tab. VIII, fig. 28. 

 Plankton from »the mouth of Sandsvatn« (S and 6). 



NAVICULÆ PUNCTATÆ Cl. Syn. II, p. 37. 



92. Navicula scutelloides W. Sm., var. minutissima Cl., Cl. Gronl. 

 & Argent. tab. XVI, fig. 10. 



Rare. Sand, Plankton from »the mouth of Sandsvatn« (S and 6). 



93. N. pusilla W. Sm., V. H. Syn. tab. XI, fig. 17. 

 Hero and there. 



Var. lanceolata Grun., Strose Kl., fig. 10. 

 Plankton from »the mouth of Sandsvatn« (San do). 



94. N. humerosa Bréb., V. H. Syn. tab. XI, fig. 20. 

 Plankton from »the mouth of Sandsvatn« (S and 6). 



95. IM. amphibola Cl., Lgst. Spetsb. tab. II, fig. 7. 

 Rare. Nol so; Trangisvaag (Sydero). 



NAVICULÆ LYRATÆ Cl. Syn. II, p. 52. 



96. Navicula pygmæa Kutz., A. S. Atl. tab. LXX, fig. 7. 



Trangisvaag (S 3^ de ro). Only found in one gathering where it was 

 rather common. 



NAVICULÆ LÆVISTRIATÆ Cl. Syn. II, p. 96. 



97. N. elegans W. Sm., Donk. Br. Diat. tab. IV, fig. 1. 

 Rare. Trangisvaag (Sydero;. Plankton. 



98. N. palpebralis Bréb. var. Barclayana Greg., Greg. Diat. Cl. 

 tab. IX, fig. 9. 



Rare. Trangisvaag (Sydero). 



Var. obtusa V. H., V. H. Syn. tab. XI, fig. 8. 



Rare. Ornefjæld (S3'der6). 



99. N. tubulata m. Fig. 36 ^oo/i. 

 L. 0,026 mm., B. 0,011 mm. Striæ about 20 in 0,01 mm. 

 Valve lanceolate with apices obtuse, truncate. Terminal 



nodules small, situated at the apices. Striæ parallel, absent 

 from the centre. This unstriated part is oval on the one 

 side of the raphe and extends right to the margin, while 

 Fig. 36. Qj^ ^j^g other side it only reaches about half way between 



