PLATE XVII. 



Figures magnlfled 500 diameters. 



Page. 



CosMARiDM CONSPERSUM ; two forms, . . . 82 



COSMARIUM OOHTHODES, . • 84 



" " empty cell of smaller form, . . 84 



CosMABiuM Amcendm, . . . . 85 



" " Var. tumidum, . . . .85 



CoSMARIUM ELEGANTISSIMUM, , . . . 86 



COSMARIDM RENTFORME, .... 84 



" " smaller form, empty cell, . . 84 



COSMARIUM POBTIANUM, . . . . . .84 



" " cell dividing, . . 84 



" " zygospore and emptied semi-cells, . 84 



CosMARiuM Broomei, Var. (Compare Plate XX, figs. 6-9), 93 



Figs 16, 17. CosMARiHM PYRAMiDATUM, two forms, One cell empty, . 74 



" IS, 19. " " Var. stenonotum, . . 74 



" 20, 21. COSMARIUM ORBICCLATnM, . . . . .85 



