EXPLANATIONS AND REFERENCES, 



PLATE CLXI. 



Figures magnified 500 diameters. 



PAGE. 

 Fig. 1. PROTOCOCCI/S VIRIDIS, a simple cluster of cells, (182), 181 



Figs. 2, 3. Var. infusionum, aquatic form, . 182 

 Fig. 4. PROTOCOCCUS GIGAS, single cells without tegument, . . 183 

 " 5-1.1. " " cells with wide tegument divided and re- 

 divided, . . . . .183 



" 12. " u cells dividing into twos, . . 183 



" 13. " " cells divided into fours, . . .183 



" 14-20. PROTOCOCCUS WIMMERI ; cells simple, dividing, and divided, 183 



