EXPLANATIONS AND REFERENCES, 



PLATE CLXXX. 



Figures magnified 250 diameters. 



PAGE. 

 Fig. 1-3. TOLYPOTHRIX DISTORTA, usual form, .... 263 



" 4. " " forma magma. . . 263 



Figs. 5, 7. TOLYPOTHRIX PULCHRA, ..... 264 



Frjj. 8-10. TOLYPOTHRIX RAVENELII, from Florida specimens, . '265 



" 11-13. TOLYPOTHRIX RUPESTRIS, Pennsylvania, . . . 265 



u 14-16. TOLYPOTHRIX FLACCIDA, parts of three filaments, . . 265 



