EXPLANATIONS AND REFERENCES, 



PLATE CCIII. 



Figures magnified 250 diameters. 



PAGE. 

 Figs. 1, 2. LEPTOTHRIX TENAX, ...... 319 



" 3, 4. MlCROCOLEUS HYALINUS, ..... 307 



Fig. 5-9. MICROCOLEUS ANGUIFORMLS, represents also M. terrestris, Var. 



Vaucheria, . . 306, 305 



Figs. 10, 11. MICROCOLEUS GRACILIS, ...... 30G 



Fig. 12-14. MICROCOLEUS RAVENELII, from near Houston, Texas, . 307 



