PLATE XVIII. 



Figures magnified 500 diameters. 



Page. 



79 



R0 



81 



Figs.] 3. Cosmarium Kitchel.ii, front, end and lateral views, 



1,5. Cosmarium orthostichum, front and lateral views, . 7s 



6, 7. Cosmarium si renati m. fronl and Lateral views, . s l 



8,9. Cosmarium quadratum, front and end views, . . 59 



Fig. 10. " " larger form, .... 59 

 11. Cosmarium ^ it-. . . . . . .59 



Figs. 12, 13. Cosmarium parvi li ml, fronl and side view-. . . . 59 



14, 15. Cosmarium Schleipacheaxum, front and end views, . 82 



in 1^. Cosmarium nitidulum ; a form; ends not usually so convex, . 62 



Ml'. 19. C08MARIUM PSEUDOKITIDl'LUM, .... 62 



20. Cosmaru m 11 midum, ;i coarsely granulate variety, . . 78 

 Kigs. 21, 22. Cosmarium sublobati m. 



23, 24. Cosmarium l'BUciatum, fronl and end aspect. 



I'"). "J"',. Cosmabii m kiii -1 m. front and end aspect, . . .80 



Fig. 27. Cosmarium Hammebi, Var. intermedium, . . .78 



Figs. 28 30. Cosmarium Phaseolus, three views, 81 



31,32. " smaller variety ; zygospore with husks 81 



of cells attached, . . s 1 



33-35. Cosmarium Seelyanum, front, end and side views, . 73 



36,37. Cosmarium Hammeri, Var. inflated sides, . . . 7 ( .t 



Fig. 38. " zygospore with remains of cells, 7'.i 



Figs. 39 12. Cosmarium ornatum, two sizes, four views, . . 82 



13 15. " " :> variety, front, side and end views, 82 

 16 (n. Cosmarii M coelati m. fronl and side views; transverse vie* 



of an empty semicell, . 

 49,50, Cosmarium commissurale, front, and transverse view, 

 Fig. 51. '" " zygospore, husks of cells nol de- 

 tached 83 



83 

 83 



