316 C. M. CHILD. 



November 6 : Seventeen days after section : 

 A. Marginal tentacles 5 mm.; labial tentacles 0.51 mm. At 

 aboral end outgrowth of new tissue 2 mm. 



C. Marginal tentacles 3-4 mm.; labial tentacles 0.5. At aboral 

 end of outgrowth of new tissue I mm. 



D. Marginal tentacles 1-2 mm.; labial tentacles not yet visible. 

 November 1 2 : Twenty-three days after section : 



A. Marginal tentacles 10 mm.; distinctly marked with the 

 characteristic transverse bands ; labial tentacles 23 mm. At 

 aboral end margins of old body-wall are becoming involved in 

 the growth and losing pigment ; the unpigmented area, includ- 

 ing outgrowths, is about 3 mm. in length from aboral end. 



C. Marginal tentacles 67 mm.; transverse pigment bands 

 visible but not dark as in A ; labial tentacles 2 mm. At aboral 

 end new outgrowth 1.5 mm. 



D. Marginal tentacles 56 mm. still unpigmented ; labial ten- 

 tacles i mm. 



November 20 : Thirty-one days after section : 

 A. Marginal tentacles 12-13 mm.; pigment bands dark and 

 distinct ; labial tentacles about 3 mm. Aboral end as before. 



C. Marginal tentacles 89 mm.; pigment bands distinct but 

 less dark than in A; labial tentacles 22.5 mm. At aboral end 

 unpigmented area 23 mm. in length. 



D. Marginal tentacles 68 mm.; pigment bands visible but less 

 dark than in C ; labial tentacles 2 mm. 



December 2 : Forty -three days after section : 

 A. Marginal tentacles 1213 mm.; labial tentacles 3 4 mm. 

 At aboral end the new outgrowth is becoming pigmented. 



C. Marginal tentacles 10 mm.; pigmentation of tentacles 

 scarcely distinguishable from that of A ; labial tentacles 3 mm. 

 At aboral end the unpigmented area about 3 mm. 



D. Marginal tentacles 1213 mm.; pigmentation slightly less 

 dark than that of A ; labial tentacles 3-4 mm. 



At this time regeneration is essentially complete in the pieces ; 

 no further increase in the length of tentacles, or of the new growth 

 at the aboral end occurs. The marginal tentacles of C and D 

 are still slightly lighter in color than those of A, and the pigment 

 has not yet extended over the aboral outgrowth in C as far as in 

 A, but these slight differences are later eliminated. 



