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DESCRIPTION OF PLATE W. 



THE LIMNiAS, OR WATER-NYMPH, 

 ( Page 58. ) 



[The Figures highly magnified.l 



A group of eight individuals of the Hornwort Limnias, (Limnias cera- 

 tophylli), is here represented. 



a, The animalcule entirely withdrawn into its tubular case. 



b, The rotatory organs and cilia fully expanded in the parent ani- 



malcule, within the sheath of which several eggs, (e, e,), may 

 be distinguished. 



The animalcules are represented in different states of protrusion and 

 expansion from their tubular cases, or sheaths. 



