1921.] N. Annandale & R. B. S. SewEW, : Vivipara. 



237 



From each buccal ganglion three nerves arise, two of these pass 

 obliquely upwards towards the dorsal aspect of the buccal mass, but 

 the third and largest passes l^ackwards and downwards around the 

 posterior aspect of the buccal mass, below the oesophagu^ and 

 above the radular sac^to the ganglion of the opposite side./ This J^ 

 is the buccal commissure, (iii) This nerve arises just external to 

 the buccal nerve and passes forwards and downwards to the lower 

 part of the lip of the mouth ; it gives off a branch which passes 



ViG. 8. — Vivipara bengalensis, nervous system of the right side, ant n , 

 antennal nerve ; a.p.n., anterior pedal nerve; a. ;-.»;., anterior retractor muscle of 

 buccal mass; i.e., buccal commissure ; b.g.. buccal ganglion ; h.n., buccal nerve : 

 c.^., cerebral ganglion ; c./i.c, cerebro-pedal commissure; e.p.n., epipodial nerve . 

 Leg., labial portion of the cerebral ganglion ; l.p.n., lateral pedal nerves ; opt.n.. 

 optic nerve; ot., otocyst ; p-g., pedal ganglion ; p.r.m., posterior retractor muscle 

 of buccal mass; pl-g-. right pleural ganglion ; ^/.^c, pleuro-pcdal commissure ; 

 sp.n., supra-intestinal or right parietal nerve. 



across below the oral tube, joining with its fellow of the opposite 

 side to form the labial commissure. Three nerves arise from 

 the rounded upper and outer aspect of the cerebral portion of 

 the cerebral ganglion. From the upper aspect a stout nerve, the 

 antennal nerve, arises and passes forwards and outwards to the 

 antenna; although in the male the right antenna serves the 

 double function of a tactile organ and the intromittent organ, the 

 nerve that supplies it shows no obvious increase in size. From 



