LIS F OF CERATIÜM IN JAPAN. 123 



Ceratium flagelliferum Cl. > 



(Figs. 6, 7). 



Cleve, '03 a, p. 14, pl. VII, fig. 12.— '02. p. 26 —'01, p. 217.— '93, p. 3,(C 



tripos var. flagellifcra (n. v.)). 

 Schröder, '01, p. 16, pl. I, fig. 17 h, (C. tripos var. macroceras f. inflexa 



(Gourr.) nov. forma). 

 Gourret, '33, p. 29, pi III, fig. 44, (C. tripos var. inflexum). 



We refer the specimens to this species, since the antapical horns ex- 

 hibit tendency to show the characteristic flexure. 



Loc. in Japan : Kushimoto in Prov. Kii (T. Nishikawa coll.) ; Shi- 

 rahama in Prov. Böshü (K. Okam. coll.). 



Other known loc. : Common in tropical and subtropical Atlantic 

 between Africa and S. America, ranging from 2Ç) S. to 45°N. 



Ceratium flagelliferum var. filiformis n ° v - var 



(Fig. 11). 



This variety, characterized by the slenderness and flexibility of all 

 the horns, had been only once observed by T. Nishikawa at Wajima 

 in Prov. Noto, where the Tsushima current, a branch of the warm 

 KurosJiizuo, takes its course. The flexibility of the horns manifested 

 itself by the motion shown by them in the mounting liquid on a slight 

 touch to the cover-glass. We propose to call this form, which we 

 provisionally consider as a variety of C. flagelliferum,hy the name of 

 filiformis, since we are not quite sure if the flexibility and slenderness 

 of the horns can be regarded to be constant or not. 



Loc. in Japan : Wajima in Prov. Noto (T. Nishikawa coll.). 



Ceratium Uripos v ar.) vultur a. 



(Fig. 8). 



Cleve, '00 a, p. 1 5, pl. VII, fig. 5.— '02, p. 29.— '01, p. 234. 



Loc. in Japan: Kushimoto in Prov. Kii (T. Nishikawa coll.); 



