PLATE V. 



DECORATION OF MEMBRANES. 



FIG. 



1. Nitella mucronata. x c. 450. 



2. Nitella gracilis. x c. 450. 



8-5. Nitella tenuissima. 3. Early stage in development 

 of decoration. 4. Beaded reticulation of fully 

 developed membrane. 5. Inner colom^ed membrane. 

 All x c. 600. 



6. Nitella batrachosperma. 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. 



