PLATE XVI. Fig. 28. Section through the junction of the hypostome and 

 the tentacle. The arrows indicate the approximate plane of attachment of 

 the tentacle (on the right of the arrows) to the hypostome. The interface of 

 the endodermal cells (EN) and the mesoglea (M) has a characteristic scal- 

 loped appearance. Muscle filaments on the epithlio-muscular cells are per- 

 haps better developd in the tentacle than in the hypostome. 



3H 



