Microplanlion from, Un F'ninisli W'a/rrs i/iirimj Ihr Montli of May 1913. 'il 



SYSTEMATICALLÏ l'NKXOWN FORMS. 



Radiosperma corbiferum Meunier. 

 (Fig. 30.) 



1910 Meunier, p. 96, pi. 6, f. 16—18. 



The cell-body is conical with rounded end. The base of the cône is surrounded by 

 a funnel-shaped parachute, consisting of a rosette of S-shaped threads connected by a 

 ring at a little distance from the cell-body and further ont by obliquely placed threads. 

 The parachute is not coloured with chloroïodide of zinc and is not totally distroyed by 

 being sligtly heated. lt consists very probably of chitin. 



The diameter of the cell-body without parachute was about 42 <«. 



This remarkable form is not very rare, it is noted from all the stations except F 50. 

 In spite of the greatest number of individuals only being 200 cells pr. litre (station 

 F 74), this species strongly attracted the attention on account of its size and the beauti- 

 ful shape of its parachute. 



Xantlndium multispinosum Moebiüs. 



(Fig. 31.) 



1908 Trochisia multispinosa Lemmermann, p. 17. 

 1910 Kyste chitineux Meunier, pi. 23, f. 21. 



This little cell is no doubt the resting-stage of some organism. The diameter was 

 about 16 «. 



Fig. 31. Xanthidium tmütispinosum. 



1100 



It occurred at all the stations in small quantifies, most equally distribnted at sta- 

 tion F 23 with the maximum of 320 cells pr. litre in the depth of 30 mètres. 



N:o 5. 



