222 Ernst Østrup. 



Chætoceros Ehr., 1844. 

 Chætoceros Diadema (Ehr.) Gran, Gran. Nord. Plankt., 84, fig. 

 102 b. 



Lo c. Koldewey Isl. (Algæ, 3 sampl.), Marg. of the Pack-ice. 

 Ar ct. Di St. W. Greenl., East Arct. S. 

 Only spores found. 



Chætoceros septentrionale Øst., Øst. Mar. D. Østg., 457, Tab. 

 VII, fig. 88. 



Lo c. Off Cape Amélie (Algæ), Marg. of the Pack-ice. 



Arct. Distr. W. Greenl, E. of Greenl., East Arct. S. 



Chætoceros sociale Laud., Gran. Nord. Plankt., 96, fig. 123. 



Lo с. Koldewey Isl. (Algæ). 



Arct. Distr. Sea W. of Greenl., East Arct. S. 



Only spores found. 



Stephanopyxis Ehr., 1844. 

 Stephanopyxis Turris (Grev., Ralfs) Grün. var. Cylindrus Grün. 

 forma inermis. Grün., Fz. Js. Ld. 35, Tab. V, figs. 10—13. 

 Lo с. Koldewey Isl. (Algæ). 

 Arct. Distr. Franz-Josef Land. 



Thalassloslra GL, 1872. 

 Thalassiosira decipiens (Grün.) Gran, Gran. nord. Plankt. 17, 

 fig. 10. 



Lo с. Off Germ. L. (Land-Ice), Marg. of the Pack-ice. 



Not before recorded from Arctic Seas. Several other records. 



Thalassiosira gravida CI., Gran. Nord. Plankt., 18, fig. 12. 



Lo с: Off Germ. L. (Land-Ice), Marg. of the Pack-ice. 



Arct. Distr. W. Greenl., E. of Greenl., East Arct. S. 



Thalassiosira Nordenskiöldii Cl., Gran. Nord. Plankt., 16, fig. 9. 



Lo с. Off Germ. L. (Land-Ice), Marg. of the Pack-ice. 



Arct. Distr. Greenl., E. of Greenl., East Arct. S. 



Melosira Ag., 1824. 

 Melosira Jürgensii Ag., V. H. Trt. 442, Tab. XVIII, fig. 612. 



Lo с. Off Cape Amélie (Algæ). 



Hitherto recorded only from the northern coasts of Europe. 



Melosira (mediterranea Griin. var?) gelida Cl., Cl. Vega Exp., 

 490, Tab. XXXVIII, fig. 83. 



Lo с. Off Cape Amélie (Algæ), Koldewey Isl. (Algæ, 4 sampl.). 



Arct. Distr. According to Cleve (I.e.) "Mushroom Point." 



Melosira hyperborea (Grun.) Gran, Gran. Fr. N. Exp., 52, V. H. 

 Syn., Tab.LXXXV, figs. 3—4. 



Lo c. Koldewey Isl. (Algæ), Pack-Ice, Marg. of the Pack-ice (3 sampl.). 



Arct. Distr. Greenl., E. of Greenl., East Arct. S. 



