62 ARKIV FÖR BOTANIK, BAND l-t. S.O 9, 



Foss.: Ab. Hindersmossen (spores). Kk. Knjäsha? (Pl. 4, 

 f. 98). 



Distr. (brack, and mar.): Coasts of Scandinavia. 



Typical spores of this species were met with in Hinders- 

 mossen; but as regards the spores, found in the arctic-marine 

 material from Knjäsha, it is probable that they belong to 

 another species, unknown to me. 



Chaetoceras subtile Cl. — Nord. Plankton, p. 88, f. 110. 



Bay of Bothnia. 



Distr. (brack, iv.): Baltic, Kattegat. 



Chaetoceras hispidum (Ehb.) Btw. ~ V. H. Tab. 82 

 bis, f. 4. 



Foss.: Ab. Hindersmossen; Kk. Knjäsha, Koudajärven- 

 pää (spores). 



Distr. (mar.): ? 



This species, of which the spores are rather frequent in 

 Fennoscandian deposits, is not mentioned in »Nordisches 

 Plankton». It seems to come near to Chaetoceras diadema. 



Chaetoceras Amanita n. sp. — PI. 4, f. 99 (f. 100?). 



Spores 16 — 20 [j. in diameter, with one side rounded, the 

 other concave, transversely cut by a basal plan. Both sides 

 hispid. 



Foss.: Ab. Hindersmossen; Kk. Knjäsha? (fig. 100). 



It is doubtful, whether the spores in fig. 99 and 100 belong 

 to the same form. 



Skeletoiiema Grev. 



Skeletonema costatum (Grev.) Cl. — V. H. Syn. Tab. 

 91, f. 4, 8. Nord. Plankton, p. 15, f. 7. 

 Bay of Finland, Bay of Bothnia. 

 Distr. (brack, and mar.): Baltic, Atlantic. 



Paralia Heib. 



Paralia sulcata (Ehb.) Cl. — V. H. Syn. Tab. 91, f. 16. 

 Nord. Plankton, p. 14, f. 5. 



Foss.: Ka. Viborg-deposit (P. T. Cleve 1894); Sat. Pa- 

 nelia; Kk. Knjäsha; Koudajärvenpää (common). 



