282 ^ • "• omi N' i-;i-">- 



41. Nitzschia seriata Cleve, Vc^a K\\). vclcnsk. iaklL, Hd. 3, 18S;i, 

 pi. ;i8, fig. 75; Gran, Nord. Planklon, XIX, 1905, p. 129, ug. 174; N. 

 fraiidulenla Cleve, 15. Ann. Rep. Fishery Board for Scotland, part III, 

 lcS97, p. ;U)(), fig. 11; Sijncdra Holsaiiæ Hensen, 5. Ber. Komm. Unters. 

 Deutschen Meere, 1887, p. 91, pi. 5, fig. 50. 



Only found in Danmarks Havn (Aug. 1907, .July 1908) in lour 

 samples, hut mostly rare. 



I) i s tril). ^Vitlely (listril)ute(l in ()|)en seas and alon«^ the coasts, pro- 

 bably a ncritic s])eeies of nortliern, but not arctic ciiaracter. 



42. Nitzschia delicatissima Cleve, A Treatise of Phytoplanklon, 

 1897, p. 24, pi. 2, fig. 22; Gran, Nord. Plankton, XIX, 1905, p. 130. 



Found together with the preceding species in two samples from 

 Danmarks Havn, Aug. 1907. 



I) ist rib. Much like the preceding, but more restricted. 



Nitzscliiella Rahenh., 1864. 



43. Nitzschiella closterium (Ehrhg.) Rabenh., Fl. P2urop. Algar., I, 

 1864, p. 163; Ceratoneis closteriam KXwhg., Kreidethierchen, 1840, p. 64, 

 pi. 4, fig. 7; Nitzschia closterium W. Smith, Syn. British Diatoms I, 

 p. 42, pi. 15, fig. 120; Gran, Nord. Plankton, XIX, 1905, p. 129, fig. 172. 



Found together with the preceding in two samples from Dan- 

 marks Havn (Aug. 1907) and further in one sample from the coastal 

 water (July 1908); a littoral species which sometimes occurs in 

 plankton as it often inhabits mucilage of other organisms. 



Dis tri b. Ubiquitous along the coasts. 



