114 
Fig. 
Or eH GC bp 
ig. 10. 
LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION OF PuATES II. and III. 
. Protococcus pluvialis Ktz.; a, motile condition, 
b, palmella-condition (x 400). 
. Microcystis marginata Men. (x 400). 
. Calospherium Kiitzingianum Nag. (x 400). 
. Schizothriv anglica Benn. ; a, hormogone (x 400). 
. Staurastrum teliferum Ralfs; a,b, two stages in 
the process of division (x 400). 
. Pandorina morum EKhrb.; a, swarming coenobe, 
b, zoogametes conjugating (X 500). 
. Hudorina elegans Khrb.; a, zoosphere, b, anthero- 
zoid (x 400). 
. Volvox globator Ehrb.; A, coenobe (x 200); 
a, antherids, b, oogones, ¢, flagellate peripheral 
cells; B, oosphere and antherids within oogone; 
C, flagellate peripheral cells (more highly 
magnified). 
. Eetocarpus siliculosus Ktz.; a, female zoogamete, 
eradually losing its flagels 6, male zoogametes 
swarming round female zoogamete, ¢, stages in 
the coalescence of the zoogametes (x 800). 
Zanardinia collaris Crouan; a, zoosphere, 6, an- 
therozoids, c, coalescence of antherozoid and 
oosphere, d, fertilised oosphere (x 800). 
