The Conjugation of Zygogonium ericetorum Kiitz. 241 
Fig. 1, Zygogonium evicetonm : A, early stages in conjugation ; on the right 
the gametangia are seen to have been cut off. B, ditto, the lower filament being 
in a more advanced stage of development than the upper one. C, two 
gametangia, separated in the process of mounting : a = thin inner wall of 
gametangium ; D, a, very early stage in the fusion of the gametes; b, later 
stage in ditto ; c, a still later stage. all X GOO 
