EXPLANATIONS AND REFERENCES, 



PLATE CXVIII. 



Figures magnified 125 diameters. 



PAGE. 



Figs. 1, 2. ULOTHRIX TENUIS. . . . . . .134 



Fig. 3-5. ULOTHRIX AEQUALIS, . . . . .134 



" 6-8. ULOTHRIX RIVULARIS, . . . . . .136 



Figs. 9, 10. ULOTHRIX SUBTILIS, ...... 136 



" 11, 12. ULOTHRIX SUBTILISSIM A, . . . . .136 



" 13, 14. ULOTHRIX, Var. staynorum, ..... 136 



u 15, 16. ULOTHRIX, Var. variabilis, ..... 136 



Fig. 17. ULOTHRIX, Var. tenerrima, .... 136 



" 18-19. ULOTHRIX THERMARUM, ..... 136 



" 20-21. ULOTHRIX COMPACTA, . . . . .136 



" 22-26. ULOTHRIX SUBTILIS, an unusual form, .... 136 



Figs. 27, 28. ULOTHRIX FLACCIDA U. SUBTILIS, . . . 137, 135 



Fig. 29-33. ULOTHRIX RIVULARIS, Var. cataracta, .... 137 



" 34-36. ULOTHRIX OSCILLARINA, . . . . .137 



