I7O D. H. WENRICH. 



PLATE II. 



FIGS. 7-16. From prepared slides. X i.ioo. Figs. 7-11, type variety; Fig. 

 7, usual appearance ; Fig. 8, surface striae longitudinal ; Fig. 9, strire passing 

 from right to left; Figs. 10 and 11, show loss of chlorophyll and expansion of 

 nucleus; Figs. 12-16. variety pellucida. Note four (Fig. 12), five (Fig. 14), 

 and six (Figs. 13, 15, 16) flagella, and caryosomes from one (Fig. 12) to four 

 (Fig. 16). 



