C. M. CHILD. 



end had already attained their maximum development and were 

 undergoing reduction, and in the case of the marginal tentacles, 

 atrophy. On the aboral end of the piece four tentacle-buds ap- 

 pear. These seem to arise either from the cesophageal tissue or 

 from the line of union between the aboral end of the oesophagus 

 and the body-wall. The relations of parts is illustrated by the 



FIG. 17. 



FIG. 18. 



FIG. 19. 



FIG. 20. 



FIG. 16. 



FIG. 21. FIG. 22. FIG. 23. 



FIG. 24. 



FIG. 25. 



FIG. 26. 



FIG. 27. 



FIG. 28. 



diagrammatic longitudinal sections, Figs. 19-22. Figs. 19-21 

 show the closure and the course of regeneration during the first 

 two months. Fig. 22 represents a section of the stage shown in 

 Fig. 19, and here the relation of the aboral tentacles and oesoph- 

 agus and body-wall is seen. During the following months 



