Microplarikton from. the Finnish Waters diiring ihr Monfh of May 1912. 



23 



Gonyaulax eatenata (Levandes) Kofoid. 



(Fig. 20.) 



1894 b Peridinium catenatum Levander. 

 L894a Levander, p. 51, p]. 2. I. 22. 



1897 Vanhöffen, pi. 5, f. 5. 

 1900 Cleve, p. 256. 

 1908 Paulsen, p. 63. 



1910 Amylax eatenata Meunier, p. 52, pi. 1 bis, 

 f. 46— 47, pi. 3, f. 28—34. 



1911 Gonyaulax eatenata Kofoid, p. 287. 



1912 Jörgensen, p. 9. 



It was very remarkable to find this peculiar peridi- 



neae, which occurred in chains consisting of up to ten eells. 



It was fairly common at ail the stations except station 



F 30. At the last mentioned station the maximum was 



only 520 cells pr. litre (5 mètres). It was more numerous 



in the Gulf of Finland than in the Gulf of Bothnia. At 



station F 41 it reaches the number of 65600 

 cells pr. litre (5 mètres), at station F 50 the 

 number of 56820 cells pr. litre (5 mètres) and 

 at station F 61 the number of 80440 cells 

 pr. litre (0 mètres). At the same time sta- 

 tions F 23 and F 74 generally show smaller 



Peridinium fintandicum. niimbei'S 



-f The breadth of the chains was 27 — 33 «. 



Fig. 20. Gonijaiilax eatenata. 



500 



1 



Fig. 21. 



Peridinium finlandicum Paulsen. 



(Fig. 21.) 



1894a P. divergens Levander, p. 51, pi. 2, f. 23, non Ehrenberg. 

 1900 P. divergens var. Levandeiï Lemmermann. 



1907 Paulsen, p. 15, f. 19. 



1908 Paulsen, p. 51. 



Peridinium finlandicum was found in small numbers fairly equally distributed in 

 ail the samples. especially from the Gulf of Finland. The maximum number was fil to 

 cells pr. litre (station F 41, mètres). The breadth of the cells was 40 — 47 m. 



N:o 5. 



