2G0 INTRODUCTION. 
oesophageal ganglia; 2. suh-rcsophagcal ganglia ; 3. stomato-gastric 
ganglia; 4. nerve to the upper lip; 5. to the integument of the superior 
tentaculas; 6. to the lateral lips; 7. supra-cesophageal, stomato-gastric 
ganglionic commissure; 8. superior tentacular nerve; 9. an accessory 
branch; 10. nerve to the inferior and external tcntacuhc; 11. gan- 
glionic enlargement of do. ; 12. inferior tentacular nerve ; 13. external 
tentacular nerves; 14. nerves to the buccal body; 15. to oesophagus 
and stomach; 16. to salivary ducts and gland; 17. supra-cesophagcal , 
sub-oesophageal, ganglionic commissures; 18. nerves to podal disk; 
19. nerves to collar and pulmonary chamber ; 20. to retractor of buc- 
cal body; 21. follows course of aorta, and supplies the oviduct, ovary, 
testicle, etc. ; 22. supplies integument, collar, pulmonary chamber, and 
retractor muscles, at origin ; 23. to penis; 24. to cloaca and integu- 
ment in vicinity; 25. numerous branches to integument on each side, 
and podal disk ; 26. to retractor muscles ; 27. to tail and podal disk; 
28. large branch to integument on each side. 
Fig, II. Supra-cesophageal and stomato-gastric ganglia of Helix 
albolabris. 1. Supra-cesophageal ganglia; 2. stomato-gastric ganglia. 
3. supra-cesophageal, sub-a?sophageaI, ganglionic commissures; 4. su- 
pra-oesophageal, stomato-gastric, ganglionic commissures; 5. superior 
tentacular nerve; 6. inferior tentacular do. ; 7. to commencement of 
olfactory sinus; 8. inferior part of mouth and buccal body; 9. to inte- 
gument of lips ; 10. integument at side of mouth, and generative aper- 
ture on the right side; 11. recurrent branch to superior tentacular 
muscle; 12. to retractor of podal disk; 13. to buccal body; 14. to 
oesophagus; 15. to salivary glands. 
