26 



Caroline Leegaard. 



Lohmanniella stellaris occurred at all the stations, most numerously at station F 74 

 with the maximilin number of 1540 cells pr. litre in the depth of 20 mètres. It was 



..-' 





•v 



Fig. 24. Lohmanniella stellaris. 

 1200 

 1 ' 



often found too at stations F 23 and F 61, while it was sparsely distributed at sta- 

 tions F 30, F 50 and F 41. 



Mesodinium rubrum (Lohm.) 



(Fig. 25.) 



1908 Halteria rubra Lohmann, p. 175 (303), pi. 17, f. 19. 



1910 Cyclotricbium sp. Meunier, p. 164, pi. 15, f. 7, pi. 20, f. 17. 



1913 Hamburger und von Buddenbrook, p. 25. 



While Mesodinium-cells with mouth-cavity were not found, the closed form occurred 

 very frequently. The cells are oval with a drawn in central part, which is provided 

 with a circle of cilia. The cells are filled up with a granulär inass, which according 

 to Lohmann consists of flagellâtes living in symbiosis with the Mesodinium-individuals. 



Apparently two sorts of thèse cells occurred, some large ones (length about 40 — 

 50 ti ) and some small ones (length about 20 — 30 <<). But cells of the sizes between 

 30 and 40 ;< existed too, yet they were comparatively rare. 



The larger cells were rather assymmetrical as to the plan of the circle of cilia, 

 one of the ends being flat and broad, the other a litt le higher and somewhat acute. The 

 cells were filled with a number of grains, while the cilia were numerous and fine. 



The smaller cells on the other hand were more equally formed at both ends. The 

 contents consisted of a few grains, and the circle of cilia was not so dense as on the 

 larger form. 



Tom. XLVIII. 



