64 ARKIV FÖR BOTANIK. BAND 14. N:0 9. 



Distr. {jresli tv.): Plankton of most deeper and colder 

 lakes. 



Melosira (Gaillonella?) Westii W. Sm. — V. H. Syn. 

 Tab. 91, f. 11, 12. 



Foss.: In some marine samples from the Geol. Comm.; 

 locality unknown. 



Distr. (mar.): East Arctic Sea, Europe. 



Podosira Ehe. 



Podosira glacialis Grun. — Cleve, Baff. Bay, p. 12, 

 Tab. 2, f. 17 — 20. — Syn. Podosira hormoides var. glacialis 

 Grun. Eranz Jos. L. D. Tab. 4, f. 32. Thalassiosira gravida Cl.? 



Foss.: Kk. Knjäsha, Koudajärvenpää; frequent. 



Distr. (mar.): West Arctic Sea. 



Podosira Montagnei Kütz. — V. H. Syn. Tab. 84, f. 13. 

 Foss.: Kk. Knjäsha, Koudajärvenpää; not rare. 

 Distr. {mar.): North-East Greenland (0strup); Atl. Sev- 

 eral other records. 



Podosira Montagnei Kütz, var. minor Grun. — V. H. 

 Syn. Tab. 84, f. 9—10. 

 Foss.: Kk. Knjäsha. 

 Distr. (mar.): Atlantic. 



Podosira dubia (Kütz.) Grun. — V. H. Syn. Tab. 84, 

 f. 13—14. 



Foss.: Kk. Knjäsha, rare. 

 Distr. (mar.): Atlantic. 



Hyalodiscus Ehb. 



Hyalodiscus stelliger Bail. — V. H. Syn. Tab. 84, f. 

 1, 2. Nord. Plankton, p. 26, f. 28. 



Foss.: Kk. Knjäsha, Koudajärvenpää; frequent. 



Distr. (mar.): The Arctic Sea, very common according to 

 Cleve D. Arct. Sea, p. 4; North Sea, Atlantic. Many other 

 records. 



The form that occurs fossil in Finland measures 90 [x 

 in diameter and in thus remarkably larger than the now 



