2()S 



(". II. OSI I.MKl.l). 



(i. Kahsti:n (1. c, ]). IS.')) icjjoiis lluil hr lias loiiiid auxosporcs in 

 C.osc. radidtiis and Ki.i:haiin iii (lose, r.vccntricus, bul closer inronua- 

 lions arc nol, as far as 1 know, given concerning llic occurrence ol" 

 Ulis phenomenon in Ihe genus Coscinodisciis. 



Fig. 4. Coscinodisciis siibbiiUens Jørg. 20(1 t. in. 



Cosc. subbiiliens \vas dominant in samples from Danmarks Havn 

 and from the coast water in 19()(), 1907 and 1908 in July — September. 

 Few living specimens were present in two samples from October 190(> 

 taken in cracks in the ice of Danmarks Havn. hi the pack-ice it 

 was very rare, only few specimens seen in a couple of samples. 



Di strib. According to (iH.VN a boreal sj)ecies occurring especially in 

 the regions wliere polar and atlanlic currents meet, often in large cjuantities. 



12. Coscinodiscus marginatus Ehrbg., Abhandl. Berlin. Akad. 

 Wissensch., 1841, p. 142; A. Schmidt, Atlas Diatom.-Kunde, pi. 62, 

 figs. 1 — 5, 9 — 11; pi. 59, fig. 11; C. fimbriato-limbatus A. Schmidt, I.e., 

 pi. 65, figs. 3—6; pi. 113, fig. 2; C. limbatus A. Schmidt, 1. c, pi. 63, 

 fig. 7; Ostenfeld & Paulsen, Medd. Grønland, XXVI, 1904, p. 160. 



Som few empty frustules of this coarsely areolated species were 



found in a sample from the outer part of the pack-ice in August 



1906. 



Distrib. Oceanic temperate species known from the plankton af the 

 North Atlantic west of 26° W. Long., not at home in arctic water. 



