1919] 



MOORE AND KARRER A SUBTERRANEAN ALGAL FLORA 



291 



Ser. 

 D 



5 



5' 



6 



6' 



7 



7' 



8 



8' 



9 



Depth 





50 cm. 



50 cm. 



60 cm. 



60 cm. 



70 cm. 



70 cm. 



80 cm. 



80 cm 



90 cm 



SERIES D— Continued 



June 10, 

 1916 



June 17, 

 1916 





P. viride 





Aug. 24, 

 1916 



P. viride 



P. viride 

 Diatoms 



P. viride 



P. viride 



P. viride 

 Diatoms 



P. viride 

 Diatoms 



Mar. 8, 

 1917 



P. viride 



P. viride 

 Diatoms 



P. viride 





P. viride 

 Diatoms 



P. viride 

 Diatoms 



100 (100 cm.), 110 (110 cm.), and 120 (120 cm.), no growth. 



Nov. 22, 

 1918 



P. viride 

 Diatoms 



P. viride 



P. viride 



P. viride 



P. viride 

 Diatoms 



P. viride 

 Diatoms 



