Marine Plankton from the East-Greenland Sea. 285 



In most of the samples it occurred together with Cocc. pelagica, 

 but it did not occur in greater quantities, perhaps because it is so 

 small that it is only in a small part caught by the nets. 



C. Silicoflagellatæ. 



Distephauus Stöhr, 1880. 



5. Distephanus speculum (Ehrbg.) Haeckel, Challenger Rep., 

 Radiolaria, 1889, p. 1560; Lemmermann, Her. Deutsch, bot. Ges., 1901, 

 p. 263, pi. XI, figs.; Nord. Plankton, XXI, p. 31, figs. 103-104. 



Most of the specimens found in the samples must be referred 

 to var. septenariiis (Ehbg.) Jørg., f. regularis Lemm., 1. c, fig. 104. 



Found scattered over the area; in 1907 in three samples from 



Danmarks Havn, in 1908 also in the coastal water, and in 1906 in 



three samples in the outer part of the pack-ice. As the specimens 



examined had plasma, they must have been living when caught. 



Distrib. (of the form) Karajakfjord in West-Greenland, Baltic; (of the 

 species) oceanic species of worldwide occurrence, but hardly arttic. 



Appendix: Pterospermataceæ. 



Pterosperiua Pouchet, 1894. 



Pterosperma Vanhöffenii (Jørg.) Ostenfeld, Vidensk. Medd. 

 Naturh. For., København 1901, p. 151; Pterosphcera V. Jørgensen; 

 Pterocystis V. Lohmann, Eier u. sogen. Cysten der Plankton-Expedition, 

 1904, p. 44, pi. 7, fig. 10. 



Single specimens found in several samples (10) in 1908, both 



near the coast (in Danmarks Havn) and in the outer part of the 



pack-ice. At least some of the specimens were empty. July — August. 



Distrib. A temperate oceanic or.^anism, known especially from the 

 North Atlantic. 



28-9-1910. 



