PLATE XVII. 



Figures magnified 500 diameters. 



V m:f.. 



Figs. 1, 2. Cosmarium biretum, front and end view, . . . 86 



" .">,">. Cosmarii m Botbytib, \ ;ir. tiiiiiifluni. Wolle, Front and -i'l' 



view. . . . . .7") 



Fig. 1. zygospore, husks attached, . . 75 



Figs. 6, 7. Uosmarium Broomei, front and end view, . . 86 



8, '.'. " smaller variety and zygospore, . 36 



lull'. Commarivm Everettense; front, end, and lateral views, 85 



1.". I">. Cosmariuw \'i issillus; front and lateral and end views, N I 



16 18. Oosmarii m oj \ i >i: i !- v u 1 1 m. front, lateral and end views, *7 



19,20. Cosmahium homalodermum, front and end view, . 81 



_'l 23. < osmarii m P8E1 i ran ATI si, front, transverse and lateral 



views, .. . . .158 



"24 L'ii. Cosmarii m I'ruriMi: front, end and Lateral views, . I"> s 

 _'7, 28. Cosm mm i m protracti m. front :m<l end views, . 



Fig. 29. ( osmarii m ornatum, Var. minor, .... 82 



