32. 



ventral side of tlie posterior adductor muscle, and almost equal 

 tlie cerebral ganglia in size. Tlie commissure connecting these 

 ganglia is also verv broad an.d, like tlio cerebral commissure, 

 tends to share the structure of ganglia. 



The pedal ganglia, pg, are roxtnded bodies and are ap- 

 parently larger than either the cerebral or Tisceral, Thev lie 

 very close together and are connected by a very broad commissure. 



The cerebro-pedal, ^onlike the cerebro -vise oral commiss-ores 

 are not surrounded by nuclei and show ordinary commissural struct- 

 ure. 



Although a great many specimens of widely differing ages 

 have been examined, the double origin of each cerebro-pedal com- 

 missure from the cerebral ganglia, has not been observed. Neither 

 is a separation into cerebral and pleural ganglia evident. It 

 is true that the cerebral ganglia are not quite smooth and, in 

 some places, the outer layer of nuc'lei dips into the fibrous layer, 

 but this seems to be accounted for by the origin of nerves in 

 the immediate vicinity. The only place that can be looked upon 

 as a constriction, lies between the origin of the large anterior 

 pallial nerve, on the outer dorsal surface o C the ganglion, and 

 the origins of the cerebro-pedal comraissure, the large palpal 

 nerve, and a small f - oot maoolo nerve^. all of which leave the 4'.c^<-^«-v^ 



