Abstract
The cell division of Echinosphaerium nucleofilum, strain MA, was carefully observed under differential interference optics and a polarizing microscope, by using a microchamber for side-viewing. The results were as follows : (i) organisms undergoing cell division always exhibited intensive adhesion to the glass substratum with remarkably shortened, supporting axopodia; (ii) motive force generated during cell division was considered to be derived mainly from retraction of supporting and leading axopodia located at both ends of the just-dividing organism; (iii) poly-L-lysine-coated substratum enhanced cell adhesion considerably but did not appear to result in cell division ; and (iv) remnants of cytoplasmic connecting bridges were often observed transformed to new axopodia, in which the filamentous structures showed positive birefringence.
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