PLATE IV. 



Figures magnified 500 diameters. 



Page. 

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



gelatinous sheath ; the irregular 

 breadth is produced by the twist of 



the filament, . . 29 



" Var. planum, . . 29 



Sphaerozosma tiliforme, ... 29 



Sphaerozosma SERRATOM. See also Plate XLIII, 30 



Sphaerozosma excavatum, with gelatinous sheath, . . 30 



" " with sheath partially dispersed, 29 

 " " developed spores with empty cells 



attached, . . . .29 



Sphaerozosma vertebratum; with a decided twist, . 30 



Sphaerozosma spindlosum ? . .31 



15. Sphaerozosma Wallachii?. ... 31 



For additional varieties see — 



Plate LX. S. pulchrtjm, Var. inflatum, . 29 



Plate XLVII. S. var. constrictum. Addenda, 172 



Plate LX. S. rectanqtjlare, 31 



Plate XII. S. polchellum, . 29 



Plate XLVII. S. moniliforme, . . .30 



Plate XLIII. S. Nordstedtiana, . 31 



