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Fig. 616.— Triton nodiferus. Nervous aystem, from the dorsal side. rer. hue. con. cerebro- 

 buccal connective ; cer, g. cerebral ganglion ; col. n. nerves to the columellar muscle ; infra, g. 

 infra- uesopliageal visceral ganglion ; I. abd. g. left abdominal ganglion ; I. hr. n. left branchial 

 nerve ; I. hr. n', nerves to branchia and osphradium ; I. mant. n. left mantle-nerve ; opt. n. 

 optic nerve ; peel, con. cerebro-pedal and plcuro-pedal connectives ; ped. g. pedal ganglia ; pi. g. 

 pleural ganglion ; r. ahd. g. right abdominal ganglion ; r. hr. n. right branchial nerve ; r. buc. 

 gang, right buccal ganglion ; r, mant. n. right mantle-nei've ; supra, g. supra-intestinal visceral 

 ganglion ; tent. n. nerve to tentacle ; i-itsr. n. visceral nerve-branches 



