ever. The products of the degeneration probably pass through 

 the rhopalial canal into the digestive tract. As tliis pro- 

 cess continues, the invvard movement of the ectoderm cells is 

 more rapid than their disintegration, so th£.t '.vhen the distal 

 part of the tentacle is reduced to the size of the rhopalial 

 part (Figs. 18 and 43) it is a solid mass of small cells with 

 small nuclei that stain darkly. Some of the.se cells contain 

 a large vacuole and have the nucleus pushed to one side. Scat- 

 tered among the small cells, thei*e are numbers cf globular bo- 

 dies as large as, or larger than, the green cells, and complete- 

 ly filled with coarse granules that stain deeply with safranin ; 

 no nucleus is visible in them. "^he ocellus has now become 

 distinctly cup-shaped. (Fig. 43.) 



I At about this time the interrhopalial tentacles begin to 

 be absorbed in their turn. The umbrella margin has in the 

 mean time grown out beyond the insertion of each interrhopalial 

 tentacle and over its aboral side into two lobes with a hood 

 between. (Figs. 18 and 19.) This sti-ucture, although small- 

 er corresponds exactly to the rhopalial lobes ana hood, and is 

 further evidence for homology between the tentacles and the 

 rhopalia. In the specimen illustrated b.v Fig. 18 the inter- 

 rhopalial tentacles were in the process of absorption. The 

 drawing was made betveen the hours of 11 A. M. and 2 P. M. 



45 - 



