LIST OF CERATIUM IN JAPAN. 



Schiitt, '93, p. 269, fig. VIII a — b, (without name). 



Our specimen does not agree exactly with any of the figures given 

 in the references quoted above ; but by comparing those figures with one 

 another, we find that the curvature of palmated horns and the number 

 of digits are not constant. Consequently, we refer our Ceratium to this 

 species, though the characters of Schütt's Ceratium digitatimi (Cleve,. 

 '01, p. 215) are not known to us, owing to the regretable fact that 

 Schütt's Die Peridineen d. Plankton-Expedition, in which that species 

 should stand described, is not accessible to us. 



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



Other known loc. : Tropical Atlantic : in the Equatorial, the An- 

 tilles and the Florida current; around the Azores ; — in fact, between 12 

 and 49° N. 



Ceralium (tripos var.) bucephalum ci. 



(Fig. 13)- 



Cleve, '02, p. 25. — '01, p. 21 1. — '97 a, p. 302 ; fig. 5. — '97 b, p. 26. 

 Gran, '02, p. 194. (C. bucephalum CI.). 



Loc. in Japan : Awomori in Provi Mutsu (T. Nishikawa coll.). 



Other known loc. : The Atlantic, extending as far south as lat. 

 3C°2'N. and to Finmark in the north ; the German Ocean ; Sweden. 



Ceralium arclicum (Ehb.) ci 



(FiS- 14). 



Cleve, '01, p. 207. — '97 a, p. 302, fig. 3 (C. tripos var. arctica Ehb.)^— '97 b, 

 p. 26. 



Gran, '02, p. 196 ; p. 46, fig. 3 ; p. 193 (C. (macroceros subsp.) arcticum 

 (Ehb.) Gran). 



Schiitt, '93, p. 308 (C. tripos var. Iabradoiica Schiitt). 



Loc. in Japan : Awomori in Prov. Mutsu (T. Nishikawa coll.). ç . 

 Other known loc.: Arctic Ocean: Baffin's Bay, Davis -strait, 

 Labrador-Current. 



