PLATE V. 



Decoration of Membeanes. 



PIS. 



1. Nitella mticronata. x c. 450. 



2. Nitella gracilis. x c. 450. 



3-5. Nitella tenuissima. 3. — Early stage in development 

 of decoration. 4. — Beaded reticulation of fully 

 developed membrane. 5. — Inner coloured membrane. 

 All X c. 600. 



6. Nitella batracJiosperma. x c. 500. 



7. Nitella hyalina. x c. 360. 



8, 9. Tolypella glomerata. 8. — Early stage showing linear 

 granulation. 9. — Later stage showing spongy de- 

 velopment. Both X c. 600. 

 10. Tolypella intricata. x c. 600. 



