PLATE XXVI. 



Vorticella fluviatilis, x 600, 

 Vorticella citrina, x 510, 

 Vorticella qicadrangularis (?), x 250, 

 Vorticella elo?igata, x 420, 

 Vorticella convallaria, x 300, 

 Vorticella lo7igifilum, x 310, - 

 Vorticella sp., x 540, 

 Vorticella sp.,x8io, 



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