At 5 P. M. of that day the tentacles had been reduced to one- 

 thira the length shown in the figure ana the absorption of the 

 rhopalial tentacles was very nearly completed. 

 [ In the later stages of the absoi-pticn of the interrhopali- 

 al tentacles the broken do^Am material is evidently forced in 

 some way into the radial canal. This is well shown in Fig. 

 45, which is from a specimen at about the stage of Fig. 19. 

 In Fig. 45 we see that the axis of what is left of the tenta- 

 cle is filled with a confusea mass of disintegrating cells, 

 small nuclei, and cnedocysts, and some of this mass actually 

 extends into the cavity of the radial canal. 



The rhopaiiim(Fig.44)i3 practically complete at this stage. 

 The point (x) where the last trace of thb tentacle proper dis- 

 appearea, is still distinguishable in sections by the presence 

 of small cells with indistinct cell v/alls, and by the absence 

 of otoliths. I 



Other Phenomena of Strobiliz ation. 



'."Tiile these changes are taking place in the margin of the 

 disk, there are important changes in the general shape of the 

 animal. The horizontal constriction first noticed in Fig. 15 

 has deepened, while the fold below it has heightened. At the 

 same time the upper disk has broadened and flattened until it 

 assumes the shape sho'-vn in Figs. 18 and 19. The four uepres- 



- 46 - 



