DESCRIPTION OF PLATE I. 115 



FIG. 8. A longitudinal section of a Polype magnified, p. 15. 



e, The cellular structure of the substance of the body. 



/, The arms, or tentacula, shewn to be hollow prolongations 



from the body. 



g, The lining, or villous coat, of the stomach or digestive sac. 

 FIG. 9. The Hydra viridis, in the various attitudes it assumes when 



moving from place to place, p. 14. 

 a, The base, or pedicle. 

 6, The mouth and arms. ' 



