PLATE I. 



Figures magnified 500 diameters. 



in.ll 



Fig. 12. 

 13. 

 14. 

 15. 



16. 



17. 



Fig. 18. 



19. 



" 20. 



Fig. 21. 



" 22. 



' 23. 



24. 



l'\<:i:. 



. 22 



Gonatozygon Aspebtjm, filaments and developed zygospore, . 



" FILOSUM, ..... 



Hyai.oihki \ dthbtTiTKNB; three forms, norma] condition, 

 " " end views of two cells, 



:i eel] separated from the filament. 

 ti r-t -*{[\'j.v of conjugation, one cell in 

 front view, the other in end view, 

 advancing stages; chlorophy] of the 

 two cells concentrating in the gela- 

 tinous connecting tube, 

 the developed zj gospore, . 



I h \\.<>\ ii v.i LHDCOBA, 



II v \u>i ni:< \ 1. 1 in \. . 

 B \mi:i EDO) \ BBEBISSONTJ, ...... 



a developed zygospore, 

 first stage of development from a zygo- 

 pore; undeveloped cells enclosed in 

 latinous envelope, . 

 tond condition, the gelatinous en- 

 velope largely dissipated, 

 early form of a developing filament, 24 

 more advanced stage ; appearance of 

 notch at the middle of the cells, . 24 

 central inflation begins to show, . 24 



I'.wim-i.NA delii \ii"iM\. fully developed, . . . "J-") 



earlier stage, . . . 'l~> 



younger still, . . . _'"> 



22 

 23 

 23 



23 



23 

 23 

 23 

 24 

 24 

 24 



1>4 



_M 



