Plate V; Figures 20 to 29; Figs. 26 and 29 Magnified 500 

 Diameters; all others iooo Diameters. 



Ophiocytium parvulum (Perty) 

 Triboncma minus (Wille) Haz. 

 Dictyosphcerium Ehrenbergianum 

 Tetraedron minimum (A. Br.) 



trigonum var. punctatum 



(Kirch.) " 



Tetraedron trigonum var. pentagonum 



(Rab.) " 



Nephrocytium Naegelii A. Br. . 



Agardhianum Nag. . 

 Glcrocystis vesiculosa Nag. . . 29 



Nephrocytium Ndgelii .A. Br. . . 33 



