Plate 2 

 Fig. 1. Pleodorina calif ornica Shaw, x 250 

 Fig. 2 Haematococcus lacustris (Girod. ) Rostaf., x 1000 

 Fig. 3. Pleodorina illinoisensis Kofoid, x 450 

 Fig. 4. Volvox aureus Ehrenberg, x 266 (redrawn from Smith) 

 Fig. 5. Volvox globator Linnaeus, x 266 ( after Smith ) 



[664] 



