NUTRITION IN MEDUSjE. 89 



animal, represented in Fig. 252, was made ; four 

 of the arms (a, a, a, a), descending from the 

 pedicle, being left attached to it. In these arms, 



or tentacula, may be seen the canals, (marked 

 by the dark lines, c, c, c), which arise from 

 numerous orifices in the extremities and fringed 

 surface of the tentacula, and which, gradually 

 uniting, like the roots of a plant, converge 

 towards the centre of the pedicle, and terminate 

 by a common tube, which may be considered 

 as the oesophagus (o), in one large central cavity, 



