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WILLIAM A. KEPNEE AND ARNOLD RICH 



body. When this second rent was made, the posterior part 

 of the body was torn away (B) . In neither case when the rents 

 were being made did the proboscis show any reactions, though 

 food (F) was pushed after the projecting proboscis of B. The 

 projecting part of the body to right of the proboscis was ampu- 

 tated, and as yet no reaction of the proboscis followed (C) . About 

 half of the remaining anterior portion of the body was next 

 removed. The specimen no longer swam and when food (F) 

 was placed near the oral end of the quiet proboscis, the latter 

 showed no response (D). Finally practically all of the body 



Fig. 9 A, cut made removing left lateral nerve-trunk from region of pro- 

 boscis, proboscis inactive; B, cut made removing dorsal ganglia and right lateral 

 nerve-trunk from region of proboscis, proboscis active. 



proper was removed, as indicated by E, and immediately the 

 proboscis set up exploratory movements and a swinging to and 

 fro. Eventually the proboscis broke away and, as it swam 

 through the water, pushed a piece of its own body ahead of its 

 mouth. 



Further evidence of the inhibitory influence of the central 

 nervous system is to be seen in experiments like the following, 

 in which the specimens were cut more or less longitudinally 

 instead of transversely. 



4. In specimen shown in figure 9 a lateral cut was made 

 with a razor, which severed the connection between the proboscis 



