PLATE XV. 



Figures magnified 500 diameters. 



PAGE. 

 Figs. 1-3. DOCIDIUM TRABECULA ; two conjugated cells, pouring out the 



cytioplasm, or granular chlorophyllous 



contents and forming a zygospore, . 51 



Fig. 4. a developed zygospore, . . 51 



Figs. 5, 6. " " . a cell dividing, . . . .61 



Fig. 7. early stage of outgrowth, or new semi- 

 cells, . . . . .51 



" 8. CALOCYLINDRUS CONNATUS, very near Delps. C. ellipticum, . 59 



"9. " " 59 



" 10. " " Var. minor, ... 60 



" 11. CALOCYLINDRUS PSEUDOCONNATUS, . . . . .60 



" 12. CALOCYLINDRUS MINUTUS, ..... 59 



" 13. CALOCYLINDRUS COSTATUS, . . . . . .61 



" 14. CALOCYLINDRUS CUCURBITA, ..... 59 



" 15. CALOCYLINDRUS CURTUS, larger form, . . . .59 



" 16. " smaller form, .... 59 



" 17. CALOCYIJNDRUS RALPSII C. cylindrioum, . . . .58 



" 18. CALOCYLINDRUS DIPLOSPORA, . . . . .61 



" 19. CALOCYLINDRUS THWAITESII, . . . . . 60 



" 20. DOCIDIUM NODOSUM. (Compare Plate XIV, fig. 12), . . 54 



