248 ^^- J- Crozier, 



slowly curled up at the edges, concealing the cut surface ; this occupied! 

 about thirty seconds. The covered area was again exposed by carefully 

 unrolling the curled-in parts, after which they slowly curled in again 

 (1,5 min.), but not so completely as before. The wound on the body 

 was temporally closed by a sharp bend on the long axis at the injured 

 spot, such that, with the assistance of a deep contraction of the trans- 

 verse muscles at that point, the scar was completely hidden. 



9,50 P.M. Body was now straightened out, and the wounded surface- 

 noticeably smaller in area. 



July 31. 6,00 A.M. Edges of the wounds now indistinct, and the 

 scar surface had become covered over by a thin yellow epithelium. 



Pigmentation slowly increased, but even after three weeks the injured, 

 areas could still be seen as light-colored spots. 



Subsequent experiments dealt with the phenomena of inrolling 

 of the cut edges and regeneration, and are recorded as follows: 



Exp. 73,1. Slits cut in the body-wall. 



July 14. Three animals prepared with a lateral incision, perpen- 

 dicular to the long axis, made with sharp scissors. Parts of the respiratory 

 trees, extruded through the cuts, later withdrawn (cf. TORELLE, 1909). 

 Body turgor lost (but recovered by the next morning). No disturbance 

 of locomotion. A deep ring constriction at the level of the cuts, together 

 with a sharp bend at that place, closed the wound. The edges of the 

 wound tucked in within 5 minutes. 



July 17. Cuts healed over, only a slight scar showing. 



Exp. 29,2. Animals slit open longitudinally from mouth 



to anus. 



Isolated pieces show a strong tendency to curl in at the cut edges ; 

 this is well illustrated when the body is cut from anus to mouth along 

 the dorsal interradius, as the edges of the cut then roll in tightly, so 

 that the bodywall is coiled in a double scroll. 



Exp. 41,1. Anterior end removed. 



July 7. 9,00 A.M. Anterior end, including the calcareous and^ 

 nerve rings etc., removed from 5 specimens; length of pieces removed, 

 4,8 — 6,5 mm. 



8,30 P.M. Cut ends all closed over, and the "decapitated" pieces 

 crawled about in normal fashion, though slowly. 



July 8. 9,00 A.M. The two smaller amputated pieces dead. 



July 9. 9,00 A.M. One other anterior piece dead. 



July 12. 12,00 M. The two remaining anterior pieces showed a 

 bulging posterior regeneration cone. Preserved in alcohol. 



July 14. 9,00 A.M. A similar regeneration cone noticed on the- 

 anterior ends. All regenerated parts very pale in color. 



