22 



( ! A K O I, I N E \j E B (.; A A RD. 



PERIDINIALES. 



Comparée! with the diatoms the peridineae were very poorly représentée!, ouly a few 

 species and spécimens being found. The only exception was Goiiyaulax catenata. 



Dinophysis ovum Schutt var. baltica Paulsen. 

 (Fig. 19 a.) 



1900 Levander, p. 15, f. 1. 

 1908 Paulsen, p. 17. 



This species occurred in small quantities at all the stations. The greatest nuinber 

 was 300 cells pr. litre (station P 50, mètres). 



The length of the cells was about 50 ,</, the breadth abont 35 ,«. 



Glenodinium bipes Paulsen. 



(Fig. 19b.) 



1904 Paulsen, p. 21, f. 3—4. 



1905 Lemmermann, p. 21. 



1905 Peridinium minusculum Pavillard, p. 57, pl. 3, f. 7 — 9. 



1908 Paulsen, p. 25. 



1910 Meunier, p. 45, pl. 3, f. 18. 



Glenodinium bipes was found at all the stations, most numerous at station P 23 

 with the maximum of 920 cells pr. litre in the depth of 30 mètres. At stations F 30, 



F 74, P 50 and F 61 it occurred rather 

 sparingly, and from station F 41 it is only 

 noted once. 



The length of the cells with spines 

 was about 40 (t. the breadth about 27 (i. 



b. 



Fig. 19. 



550 

 1 



Glenodinium sp. 



a. Dinophysis baltica. 



b. Glenovinium bipes. 



Some small Glenodinium-cells occurred 

 hère and there, but not sufficiently nume- 

 rous for exact détermination. The species 

 was scarcely Glenodinium danicum Paulsen, rather perhaps Glenodinium trochoideum 

 Stein, noted from the Baltic in the „Nordisches Plankton". 1908 Paulsen, p. 23—25. 



Tom. XLV1II. 



