xii Contents. 



PAGE 



killed by Heating or Drying — The Trachelius ovum — 

 Mode of Swimming — Method of Yiewing — By Dark- 

 ground Illumination — Curious Digestive Tube witli 

 Brancbes — Multiplication by Division — Cbange of Form 

 immediately following tbis Process — subsequent Ap- 

 pearances 128 



CHAPTER XIII. 



Conclusion. — Remarks on Classification, &c. . . . 140 





