456 



T. H. MORGAN. 



worms regenerating imperfectly a few segments in front of 

 the clitellura. Moreover the List case is particularly instruc- 

 tive, because here again 30 — 40 segments were probably cut 

 off. The number of worms that were operated on at the be- 

 ginning of this experiment was unfortunately not recorded; 

 hence we do not know what the per cent, of mortality has 

 been. 



Table XII. 

 Anterior segments cut off, 11/18, '93. 



Killed, 1/21, '94. 



No. of segments regenerated. Sem. recept. 



2 —3—4 



3 — 



3 (united irregularly) 8—9—10 



3 (+ f + i) 6-7-8 



4 (+ i) 6-7-8 

 4 (+ 2 + 3 irregularly joined) — 



2 " 3—4—5 



3 —4—5 



3 (f) '5-6-7 



4 7— 8— & 

 4 (h) -6-7 



Vas. def. 

 8 

 10 

 14 

 12 

 12 

 11 

 9 



13 



3 



3(4) 



3 



3 (or four imperfect) 



4 



4 



5 



5 



2 (or three very imperfect ) 



2 (or three very imperfect) 

 Very imperfectly healed 

 Imperfectly healed 

 Healed — evidence of few rings 

 Beginning to regenerate 



j> >> 



Healed, not regenerated 

 Healed — regenerating (?) 

 „ f or more scsments. Rings ") 

 (_ faint. Small piece ) 



13 in front of clitellum 

 11 



-'-•* >» j> 



just „ „ 



17 

 14 



16 „ „ 



14 



4 

 14 



7 

 12 



" J) »» 



10 



" -to j> )> *■ 



15 



)) » 



56 old segments in front of anus. 



Calc. No. cut off. 

 9 

 8 

 4 



6(+) 

 7(+) 

 8(+) 

 8 

 9 



7{+) 

 6 

 8(4) 



12 

 14 

 13 

 23 



8 

 11 



9 

 11 

 21 

 11 

 18 

 13 

 10 

 15 

 15 

 10 

 20 



