XVI 



LIST OF THE ILLUSTRATIONS. 



3. The Tree Vorticella, or Carchesium . 



4. Jaws and teeth of the Notommata 



5. Fig. 1, Jaws and teeth of the Floscularia 

 Fig. 2, Jaws and teeth of the Brachionus 



6. Jaws and teeth of the Rotifer vulgaris 



7. Jaws and teeth of the Stephanoceros . 



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