PLATE LXIII. 



Figures magnified oflO diameters, except the Mierasterias .(To. 



|'A;K. 



Fig 1. STAURASTHUM SEXARITM, end view, .... Hi- 



" 2. MlCRASTERIAS DICHOTOMA, ... 1-3 



' 3. MlCRASTERlAS NORDSTEDTIANUM, . . . 1-5 



Figs 4,5. '' end and lateral views, . r2-~> 



Fig. 6. MlCRASTERlAS RABENHORSTTI, ... 131 



Figs. 7, 8. STAURASTRUM RAVEN EMI, . . . 157 



9, 10. COSMARIU.M NITIDULUM, . - 72A 



" 11,12. EUASTRUM URNAFORMF, front and transverse view-. . Ill 



" 13-15. EUASTRUM NORDSTEDTIANUM, side, transvers-e ;ind end views, 1 Hi 



Fig. 16. XANTHIPIUM ANTILOPAEUM, Var. Minneapolu-nse, 101 



Figs. 17-19. STAHRASTRUM QUATERNIUM, end and front views, . . 158 



Fig. 20. STAURASTRUM DOKNELLIT, .... 146 



Figs. 21, 22. EUASTRUM A BRUPTUM, variety, . . UK 



" 23, 24. STAURASTRUM FURCIGERUM, front and end views 161 



" 25,26. STAURASTRUM FURCATUM, (St. spinosum), . . . 165 



" 27, 28. STAURASTRUM PSEUDOFUROK4ERUM, front and end views, . 165 



" 29, 31. STAURASTRUM BRACHIATUM, . . . . .136 



" 32, 33. STAURASTRUM IHI.ATATUM, . . . . .142 



Fig. 34. STAURASTRUM FURC-ATUM, (St. spinosuin), . . . 165 



