PLATE LXIII. 



Figures magnifletl nOll diameters, except the Micrasterias S7-5. 



Page. 



Fig 1. Staubastrum sesarium, end view, . . 162 



" 2. Micrasterias dichotoma, . . . .123 



" 3. Micrasterias Nordstedtianom, li'o 



Figs. 4, o. ■' '■ eml and lateral views, . 125 



Fig. 6. Micrasterias Rabenhorsth, . . . 131 



Figs. 7, 8. Staurastbum Eavebielii, 157 



" 9, 10. Cosmarium nitidulum, 72a 



" 11, 12. EuASTRUM ubnafobmp, front and transverse view?, . Ill 



" 13-15. Euasteum \ordstedtias0M, side, transverse and end views, 116 



Fig. 16. Xanthidium anthopaepm, Var. Minneapoliense, . 101 



Figs. 17-19. Staurastrum QDATEENiuM, end and front viewv, 158 



Fig. 20. STAUBASTRUJt DONNELLir, . 140 



Figs. 21, 22. Euastrcm abroptum, variety, . 118 



" 2.3, 24. Stadrastrum furcigebum, front and end views, . 161 



" 25,26. Staurastrum pdecatpm, (St. spinosum), 165 



" 27, 28. Staurastruji pseudofdrcigebdm, front and end views,. 165 



" 29, 31. Staurastbum brachiatum, ..... 136 



" 32, o3. .Staurastrum dilatatum, . . . . 142 



Fig. 34. Staurastrum puEfATUM, (St. spinosum), . . 165 



