PLATE XXX. 



Figures magnified .500 diameters. 



PAGE. 



Fig. 1. EUASTRUM VERRUCOSUM, typical form, . .111 



" 2. " Var. Crux Africanum, . Ill 



" 3. " " Var. reductum, . . .111 



" 4. Var. alatnm. . .111 



" 5. transverse view, . . .111 



" 6. EUASTRUM DONNELLII, . . . . .114 



" 7. EUASTRUM NORDSTEDTIANUM, . . . . .116 



" 8. " " Var. minor, . . 11G 



Fis. 9 12 " typical varieties, . . 116 



Fig. 13. " " lateral view, . 116 



' 14,15. ETTASTKUM MAMMiux>srM, front and end views, . 113 



" 16. EUASTRUM FORMOSUM, . . . .114 



" 17. KfASTKUM ATTENUATUM, ..... 113 



Fins. 18, 19. EUASTRUM DIVARICATUM, front and end views, . . 114 



