REACTIONS OF PROBOSCIS OF PLANARIA 



95 



this the specimen swam no longer and a piece of food was placed 

 in contact with the oral end of the proboscis; still the proboscis 

 remained quiet (D). Finally, when the portion of the body 

 proper was reduced to a piece relatively as small as indicated 

 in figure 7, E, the proboscis became active at once, swung to and 



Fig. 8 A, rent made by animal tearing from needle point upon which it was 

 impaled; B, similar rent made on other side, completely exposing proboscis, 

 proboscis inactive, not accepting food (F) ; C, portion of one side of body cut 

 away at proboscis base, proboscis yet inactive, not accepting food (F) ; D, dorsal 

 ganglia amputated, proboscis inactive, not accepting food (F) ; E, cut near base 

 of proboscis, proboscis active. 



fro, and in a moment broke away and swam about ingesting 

 fragments of its own body for more than seven minutes. 



3. Figure 8 shows a rent made in a specimen by impaling it 

 on the right side of the body near base of the proboscis and 

 holding it on the needle until the animal tore from the needle. 

 In a like manner a similar rent was made at the left side of the 



