EXPLANATIONS AND REFERENCES, 

 PLATE LXXVIII. 



Figures magnified 250 diameters. 



PAGE. 



Figs. 1, 2. OEDOGONIUM FLAVESCENS, . . . . .78 



Fig. 3. OEDOGONIUM PRINCEPS, ... 93 



Figs. 4, 5. OEDOGONIUM IRREGOLARE, . . . . .79 



Fig. 6-9. OEDOGONIUM BORISIANUM, in several forms and conditions, 81 



