PLATE IV. 



Figures magnified 500 diameters 



Page. 

 Figs. 1,2. Sphaerozosma huhkim, filament enveloped in a colorless 



gelatinous sheath; the irregular 



breadth is produced by the i\vi>t 



of the filament, . . . 29 



' :;. I. ' " Var. planum, . . . 29 



5,6. Sphaerozosma ftliforme, ..... 'J'.' 



7. Sphaerozosma serratum, ..... 30 



8. Sphaerozosma excavati m, with gelatinous Bheath, . . _". 



" ;t. " with sheath partially dispersed, 29 



Figs, in l _'. developed spores with empty cells 



attached, .... "-'it 



Fig. 13. Sphaerozosma verterratum; with a decided twist, . 30 



11. Sphaerozosma spinitlosi m '.' . . . 31, 159 



" l."). Sphaerozosma Waxlachu? .... 30 



For additional varieties see Plate XI.. 



S. pi i .< ii bum, V.-ir. Lnflatum, ..... 29 



S. in I i \N'i I \ in . . . . :; 1 



