192 °] Allen: Plankton of the San Joaquin River 215 



Table 2. — Organisms Per Cubic Meter in Plankton op 

 San Joaquin River in 1913— (Continued) 



Nuclearia Pinaciophora Raphidiophrys 



simplex fluviatilis elegana 



1,269,504 

 423,168 

 317,376 



105,792 

 52,896 

 52,896 1,481, OSS 



1,600 



1,600 1,600 



3,200 



12,800 



105,792 



3,200 



105,792 105,792 



105,792 



105,792 



105,792 



