2 54 
THE TANGANYIKA PROBLEM. 
up over the oesophagus, and carries the supra-intestinal 
ganglion. From the left pleural ganglion there passes a fine 
nerve towards the supra-intestinal ganglion, which appears 
to form a dyaloneurous connection with a derivative of the 
supra-intestinal nerves. Towards the right the sub-intestinal 
connective passes from the left pleural ganglion beneath the 
oesophagus straight to the sub-intestinal ganglion. This 
ganglion is directly connected with the right pleural ganglion 
by a thick cord, and the nervous system is therefore strongly 
zygoneurous on the right. Above, the cerebral ganglia 
give off a number of anterior nerves, which are distributeol 
to the buccal mass and the parietes of the head. Among 
these there are conspicuous the tentacular nerves, which pass 
separately to the tentacles and ocular papillae. The buccal 
ganglia are situateol on the lateral walls of the buccal mass, 
and are united to the cerebral ganglia by connectives. Near 
the origin of the buccal nerves there arise two fine nerves, 
one from each cerebral ganglion, which pass forward along 
