Marine Plankton from the East-Greenland Sea. 281 



pi. 1, fig. 48; Jørgensen, Bergens Museums Skrifter, 1905, p. 106, pi. 7, 

 fig. 24; Libellus (•?) septentrionalis Østrup, Medd. om Grønland, 1895, 

 p. 439, pi. 8, fig. 97. 



Found in some samples from Danmarks Havn and the coastal 

 water, in 1906 — 1908, but scattered, and perhaps, as said under 

 Achnanthes, sometimes not distinguished from the other band-like 

 species. 



D i strib. Arctic neritic species, known from the coasts of Greenland, 

 from Barent and from Murman Sea. 



38. Navicula Vanhöffenii Gran, Bibliotheca Botanica, Heft 42, 

 1897, p. 9, pi. 1, figs. 1—3; Nord. Plankton, XIX, 1905, p. 124; Jørgensen, 

 Bergens Museums Skrifter, 1905, p. 105, pi. 7, fig. 22; N. septentrionalis 

 Cleve, Bih. K. Svenska Vet. Akad. Handl., Bd. 22, afd. 3, No. 4, 1896, 

 p. 11, non Østrup, пес Grunow. 



Recorded from four samples from Danmarks Havn (Aug. — Septm. 



1907, July 1908), but rare, and perhaps overseen. 



D i strib. Arctic neritic species, known from the coast of Greenhmd 

 and arctic Norway, from Barent and Murman Seas, further from the inner 

 Baltic (in spring). 



Amphiprora Ehrbg., 1843. 



39. Amphiprora hyperborea(Grun.) Gran, Bibl. Botanica, Heft 42, 

 1897, p. 10; Fauna Arctica, HI, 3, 1904, p. 543, pi. 17, fig. 14; Nord. 

 Plankton, XIX, 1905, p. 127; A. paludosa, var.? hyperborea Grun. in 

 Cleve et Grunow, K. Svenska Vet. Akad. Handl., Bd. 17, No. 2, 1880, 

 p. 62, pi. 5, fig. 86. 



In 1906 only found in one sample from the pack-ice and in 1907 

 in two samples from Danmarks Havn, in 1908 found scattered over 

 the whole area from Danmarks Havn to the outer part of the pack- 

 ice; always in few specimens. June — September. 



D i strib. Arctic neritic species know^i from Greenhind, arctic Norway, 

 Barent and Murman Seas. 



Nitzscliia Hassall, 1845. 



40. Nitzschia frigida Grun., in Cleve et Grunow, K. Svenska Vet. 

 Akad. Handl., Bd. 17, No. 2, 1880, p. 94, pi. 5, fig. 101; Gran Bibl. 

 botanica, Heft 42, 1897, p. 10, pi. 1, fig. 11; Nord. Plankton, XIX 1905, 

 p. 129. 



Found scattered in three samples from Danmarks Havn (Aug. 



1907) and in three samples fiom the coastal water (Aug. 1906, July 



1908). 



Distrii). Arctic coast species, not true plankton form, known from the 

 Arctic coast and the inner Baltic. 



