THE LOWER FORMS OF LIFE. 



79 



If you will look at Fig. 101 you will observe that lower down 

 such a stem is attached to a piece of rock. Then remember that 

 this ccenosarc in its totality, and the stomach and heads in the 

 hydrothecse, termed polypites in their totality, constitute the com- 



-102 



Fig. 101. Laomedea gelatinosa, natural size ; polyps reddish. 



Fig. 102. Part of the same magnified ; o, polyps with tentacles expanded in search of food; 

 6, the same retracted into c, the hydrotheca ; d d d, the coenosarc. 



pound animal called, with its external covering, a Zoophyte. And 

 further, let me repeat, that this compound animal is formed of an 

 outer skin, called an ectoderm, and an inner skin, called an endoderm, 

 and that the centre is hollow throughout, constituting what is 



