Uroneina elongatuin. 
161 
Uroncma elongatuin sp. n. Figs. 1-11 x 800. 
Fig. 1, apical part of filament, showing the acuminate apical cell , 
Fig. 2, basal part of same filament showing the attenuated basal cell 
affixed to tbe subtratum by a mucous cushion ; 
Figs. 3-5, forms assumed by the apical cell of the filament ; 
Fig. 6, vegetative division ; in the lower cell the chloroplast has divided 
prior to cell divisions; the two upper cells are daughter cells from a recent 
division ; 
Fig. 7, liberation of macrozoogoidia ; 
Fig. 7a, free zoogonidium ; 
FiGS. 8 10, successive stages in the germination of the zoogonidium to 
form a new filament, and showing the early formation of the acuminate apex; 
Fio. II, empty zoogonidangium, the wall of which has become much 
thickened. 
