PLATE XVI. 



Figures magnified 500 diameters 



(if, 

 66 



Page. 



I ci-M VIM CM I "\ IK \' TIM. . . . . . 63 



< OSMARIUM SINUOS1 M. . . . 65 

 ( loSM \l:HM \' \i;|m|. \ n M, .... 63 



Cokmaridm pseudopyra'midatum, small variety, . . 69 



Cosmajuom MiMi.iiiMi ; four forms, .... 65 



Cohmariuw SEXANfii lark, < ompare Plate XLIX, lit:. 13, 63 



Cokmarium iM'i hum. Var. crenulatum, . . 61 



Cosmaridm M ii \ r.i i i . . . . 66 



< OSM IRIUM Kl l\-' Mil. . . '' v 

 i. 13, 14. COSMARIUM EX1UUUM, 



Fig. 15. I I KM IRIUM ACTTLEATUM, 



16. ' "-m m:ii m i r\ \ i r \i. . . 65 



Figs. 17, 18. Cosmarium Baileyi ; (O. depressum, Bail.), . . 64 



19,20. Cosmarium undui.atum; and Var. crenulatum, 



21. " ;i 8) oospore, . 



22. MAR1UM ANSATUM, . 



Figs. 23 25. Cosmarium Holmiense, varieties, .... 68 

 26,27. Cosmarium rRACHYPi/EURUM, normal state and cell dividing, 



_> N 29. " " transverse and side views, . <'! 



I ijB 30. < OSMARII M POl VGONUM, . . 65 



" 31. I 09M IRIUM I IN< I DM, . '>' 



Pigs. 32 34. Cosmaridw rAXiCHONDRUM ; two forms and lateral view nl 



empty cell, . .71 



35,36. COSMARII M SmoLANDICUM, . '''' 



Fig. 37. I n-\i\i:i|-\| VENU8TDM, . . . .68 



I i.j-. :;^ in. Cosmaridw poi/vmazum, front, end and lateral views, . 70 



" 41. 12. < lOSM \ RIUM I "\\ l.l.l.ll. . . ' 



1 : ; 4 - > . CosMARirjM inisochondrum, front, end and side views, . <- 



U\ 18, Cosmarium oaleritum, three varieties, 



6" 



7ii 



