312 



Ove Paulsen. 



measures of this species: 38, 45, 48, 52, 56, 66 /;f. P. pellucidiim was 

 the commonest Dinoflagellate in the samples, it occurred in Dan- 



B^\ ^^ С 



Fig. 11. Peridiniiim pelliicidam. 'M'y t. m. 



marks Havn, the coastal water, the pack-ice and in the open sea, 

 and often frequently. 



Distrib. Widely distributed neritic species, occurring from tlie Medi- 

 terranean to Spitzbergen and Greenland. 



15. Peridinium islandicum Paulsen, Meddeh fra Kommis, f. 

 Havundersøg., Ser. Plankton, Bd. I, No. 1, 1904, p. 23, fig. 7; Paulsen 

 Nord. Plankton, p. 49-50, fig. 62; Broch, Spitzbergen Plankton, 

 p. 46, fig. 18-20. 



The cells were rather flat, es they have been figured by Broch. 



A single specimen measured was 44 fi long. Icelandic specimens 



are 53 — 62 ju (Nord. Plankton.) The species was fairly common in 



Danmarks Havn, the coastal water, and the pack-ice, but in the 



open sea it was found once only. 



Distrib. Arctic neritic species, known from Nortb Iceland, Spitz- 

 bergen and Greenland. 



16. Peridinium varicans n. sp. (fig. 12). 



Celhila globoso - rhomboidea, 



epiiheca acuta, hypotheca spinas 

 dims divergentes f^varicantesj a 

 fissura longitudinali remotas gerente 

 et inter spinas tinea paulum et 

 regulariter curvata terminante, cin- 

 gulo transverso dextrorsum circum- 

 iente, fossa longitudinali lata ad 

 marginem sinistram ala augusta 

 praedita. Epitheca tabulis 14, in- 

 tercalari о parvo, hypotheca ta- 

 bulis 7 constructa. Long. cell. 

 36ц. Hab. rarissime in mare gelido prope oram orientatem Groen- 

 land iae. 



This species which was found in two samples from the coastal 



Fig. 12. Peridinium varicans. «TTTi t. m. 



