



v> ^ — ^ 



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EXPLANATION OF FIGURES 



Below, the general position of llie ganglia is shown. On the left above is an 

 enlarged longitudinal section of the upper ganglia and just below it a cross-section 

 through the brain and sulxrsophageal with the oesophagus in the space between. The 

 two upper central figures are longitudinal and cross-sections of about the tenth 

 ganglion. The last figure to the left is a longitudinal section of the last ganglion. 

 The dorsal side is up in all the figures. The sections are all enlarged 170 times, the 

 figure of the whole animal is enlarged 20 times. 



