EXPLANATION OF PLATE VII. 



FIG. 17. Limax maximus. Dorsal view. 1,2, 3, nerves to mantle and pallial 

 cavity ; 4, visceral ganglion ; 5, genital nerve ; 6, reno-cardiac nerve ; 7, nerve to 

 liver and intestine. 



FIG. 18. Ariolimax columbianus. Dorsal view. I, 2, 3, nerves to mantle and 

 pallial cavity; 5, reno-cardiac nerve ; 6, nerve to intestine and liver. 



FIG. 19. Helix (Arionta) dupetitouarsi. Dorsal view. I, 4, nerves to mantle ; 

 2, nerve to pallial cavity; 3, visceral nerve ; 5, branch to genital organs; 6, branch 

 to lung ; 7, reno-cardiac nerve. 



FIG. 20. Loligo pealii. Ventral view. I, commissure between the visceral 

 nerves ventral to the vena cava ; 2, nerve to the viscero-pericardial envelop; 3, 

 nerves to rectum and duct of the ink gland; 4, nerves to ink gland; 5, nerve to 

 penis; 6, cardiac nerve ; 7, auricular nerves ; 8, nerves to adductor muscles on the 

 gills ; 9, ganglia on gill ventricles; IO, ganglia on auricles ; II, nerves to vena cava. 



FIG. 21. Ommastrephes illecebrosa. Ventral view. I, nerve to vena cava ; 2, 

 nerve to ventricle ; 3 and 4, nerves to genitalia and osphradium ; 5, nerves to 

 auricles; 6, nerves to the gill ventricles; 7, anastomosing branch between nerve 4 

 and the ventricular nerve ; 8, nerve connecting the left visceral nerve with the gastric 

 ganglion ; 9, commissure between the brain and the gastric ganglion. 



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