98 C. M. CHILD. 



ginal tentacles on uncut side 3 mm., on cut side 2-2.5 mm. ; 

 lateral marginal tentacles 3 mm. The regeneration of the ten- 

 tacles over the lateral cut is somewhat retarded. Fig. 3 repre- 

 sents a diagrammatic longitudinal section through the oesophageal 

 region at this stage. 



November 12.- -Nineteen days after section (Figs. 4 and 5). 

 Terminal marginal tentacles on uncut side 6-7 mm.; on cut side 

 i mm.: lateral marginal tentacles 6-7 mm. Terminal labial 

 tentacles on uncut side i mm.; on cut side absent : lateral labial 

 tentacles i mm. The terminal disc on the uncut side and the 

 partial lateral disc are well distended, while that part of the ter- 

 minal disc which lies over the cut is collapsed and wrinkled. 

 The distended portion of the lateral disc and the terminal disc 



FIG. 4. 



are gradually approaching the same level. At this stage the 

 regeneration of the terminal tentacles over the cut is not only 

 retarded but has ceased and the tentacles are decreasing in size. 

 The wrinkled appearance of the portion of the body bearing 

 these tentacles shows clearly that it does not share in the dis- 

 tension of the other parts. 



The diagrammatic figures (Figs. 4 and 5) represent respec- 

 tively the relations of parts in longitudinal section and in oral 

 aspect. In Fig. 5 the shrivelled half of the margin with its re- 

 duced tentacles is clearly shown. One tentacle at each end of 

 this reduced region is somewhat longer than the other reduced 

 tentacles. Evidently this tentacle on each side arises over the 

 intermesenterial chamber abjoining the distended part of the 

 body. Probably the greater length of these two as compared 



