PLATE XIX. 



Figures magnified 500 diameters. 



Page, 



cosmarium contractcm, . . 68 



cosmaridm sinuosdm, . . 70 



cosmarium variolatum, . . . 68 



CosMARiUM PSEBDOPYRAMiDATUM, suiftli variety. (Compare 



Plate XVIII), 75 



CoSMARiTJM Meneghinii, four forms, . 76 



CoSMARiuM SEXANGtJLARE. (Compare Plate LX, fig. 13), 69 



CoSMARiuM UNDDLATUM, Var, crenulatum, ... 73 



COSMARIUM NOTABIIE, . . .72, 86 



COSMARIUM Reinschii, . . 73 



Pigs. 13, 14. CoSMARIUJt EXIGODM, . 72 



Fig. 15. COSMARIUM AOULEATUM, . "1 



" 16. CoSMARlnM LUNATUM, 71 



Figs. 17, 18. COSMARIUM Baileyi; (C. (lepre«siim, Rail.), . 69 



" 19, 20. COSMARIUM undulatum; and Var. crenulatum, . 72 



Fig. 21. " " a zygospore, 72 



" 22. CoSMARIUM ANSATUM, . . 74 



Figs. 23-25. CoSMARiDM Holmiense, varieties, . 74 

 " 26, 27. CosMAEiuM TRACHYPLEURUM, normal state and cell dividing, 79 



" 28, 29. " " transverse and side views, 79 



Fig. 30. COSMARIUM POLYGONUM, . 71 



" 31. COSMAEIUM TrfTCa-UM, . . . 67 



Figs. 32-34. CosMAEiuM taxichondrum ; two forms .ind lateral view of 



empty cell, . . 77 



" 35, 36. CosMAEiuM Smolandicum, . . . 72 



Fig. 37. COSMARIUM VENUSTUM, ... 73 



Fsgs. 38-40. CosMAKiuM POiiYMAZUM, front, end and lateral views, 76 



" 41 , 42. COSMARIUM DONNELLn, ... 77 



" 43-45. CosMARiUM ANisocHONDRUM, front, end and side views, 78 



" 46-48. CosMARiUM GALERITUM, three varieties, . . .75 



