Plate 3 



Spondylo7norum quaternarium Ehrenberg, x 440 (af- 

 ter Stickney ) 



Spondylomorwn quaternarium Ehrenberg: single cell, 

 X 500 ( after Jacobsen, ex Smith ) 



Haematococcus lacustris (Girod.) Rostaf. 3, swim- 

 ming cell; 4 and 5, encysted cells, x 750 



Sphaerocystis Schroeteri Chodat, x 500 



Palmella mucosa Kuetzing: 8, habit of colony, x I1/2; 

 9, portion of colony, x 440 



Figs. 10, 11. Gloeocystis planctonica ( West & West ) Lemmermann, 

 x500 



Volvox tertius A. Meyer, x 266 (redrawn from Smith) 



Elakatothrix gelatinosa Wille: 13, x 1000; 14, x 500 

 ( after Smith ) 



Gloeocystis vesiculosa Naegeli, x 500 



Gloeocystis gigas ( Kuetz. ) Lagerheim, x 1000 



Gloeocystis ampla ( Kuetz. ) Lagerheim x 440 



[ 666 ] 



