REACTIONS OF PROBO.SCIS OF PLANARIA 



93 



of the proboscis and the first cut (B) ; three waves passed over the 

 proboscis during five minutes, otherwise it was quiet. Then a 

 cut was made quite near the base of the proboscis (C) and the 

 latter writhed in the sheath foi" two minutes, then became in- 

 active. The next cut was made at the base of the proboscis, and 

 at once the proboscis became active and wriggled out of a tear 

 in the sheath that had been made accidentally. After ninety 

 seconds the proboscis suffered autoamputation {D, E). 



B 



D 



Fig. 6 Dorsal ganglia amputated; B, more anterior portion removed; C, addi- 

 tional removal of anterior part of body; D, cut made near proboscis base, pro- 

 boscis in sheath; E, proboscis underwent autoamputation and wriggled from rent 

 made accidentally in sheath. 



