Cell division in marine Ceratium. I

The binary fission of 3 forms of marine Ceratium, C.gibberum, C.gibberum f.sinsitra and C.tripos f.atlantica was observed in culture. In either of the 3 forms, it is possible to make cell division take place under the condition of single cell culture. Both binary fission and chain formation have been observed. Concerning the relationship between binary fission and chain formation, light intensity may be considered as a controlling factor.