10 P. T. CLEVE, DIATOMS FROM FRANZ JOSEF LAND. 



DiatomcUa Balfoureana Grev. — W. Sm. Syn. II, LXI, 

 383. — Not rare in some samples. 



Nitsseliia (TrybUonella) dehilis (Arnott). — Occurs in 

 several samples, but nowbere in any abuudance. 



N. hungarica Grun. — L. 0,04; B. 0,oö9 mm. Puncta 8. 

 Str. 20 in O.oi mm. — Tliis species was found abundantly 

 in one samj)le. 



N. therniaUs v. minor Hilse. — V. H. Syn. LIX, 22. — 

 Common. — L. 0,032; B. 0, 004 mm. Puneta 11 in 0, 01 mm. 

 No striation seen. 



N. hyhrida Grun. var. — L. O, o 6 mm. Puncta 10. Str. 25 

 in 0,01 mm. — Rare. 



iV. Clansii Hantzsch. — L. O.oss mm. Puncta 10 in 

 0,0 1 mm. — Common. 



N. frustulum KtJTZ. — L. 0,04; B. 0, 003 mm. Puncta 10 

 and str. 22 in 0, 01 mm. — Not rare in many samples. — 

 Some specimens (witli 8 puncta and 21 str.) agree with 

 N. Hantssdiiana Rabh., which scarcely can be distinguished 

 from N. frustnhivi. 



N. Hcufleriana Grun. — L. 0, 035— 0,055; B. 0,03 — 0,o6 mm., 

 with capitate ends. Puncta 9 — 10. Str. 22 in 0, 01 mm. — 

 Sparingly, Cape Flora. 



N. palea W. Sm. — Common in several samples. — 

 L. 0,02 — 0,04; B. 0,025 — 0,05 mm. Puncta 11 — 13 in 0, 01 mm. 

 Striation not seen. - Common. 



Denticula tenuis KiJTZ. — Some few specimens only were 

 observed in a sample from Bell Isle. 



Surirella augusta KtJTZ. — More or less common in several 

 samples. 



S. ovalis Bréb. — Bell Isle, one specimen only. 



Melosiro Boeseana Rabh. — Rare, Cape Flora. 



The diatoraaceous flora of the polar regions is now, with 

 this addition, comparatively well known, I dåre say better 

 known than any other region of the world. The diatoms of 

 Spitzbergen and Beeren Island were in 1873 earefully worked 

 out by Dr. N. G. AV. Lagerstedt.^ The diatoms of Jan Mayen - 

 and of East Greenland ^ by E. Oestrup. The diatoms of 



1 Bih. t. K. Sv. Yet.-Akad. Handl. 1, N:o 14. 



^ Botanisk tidskrift XXI: 1 Heft. Copenh. 1897^ 



^ Meddelelser om Grönland B. XV. Copenh. 1897. 



