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PROFESSOR RAY LANKESTER AND A. G. BOURNE. 



From the portion of the nerve between the anterior and pos- 

 terior branchial nerve is given off the nerve to the olfactory 



Fig. 3. — Diagram of the nervous system of Nautilus pompilius. Drawn 

 from the object by Mr. A. G. Bourue. cer. Cerebral ganglion, ped. 

 Pedal ganglion, opt. Optic ganglion (resting on the cerebral), pi. 

 Pleural ganglion. vise. Visceral ganglion. x and y. Ganglion-like en- 

 largements on nerves passing from the pedal ganglion to the infero- 

 median lobe of the inner circlet of circum-oral tentacular lobes, m. 

 Nerves from the pleural ganglion to the mantle, n. vise. The genito- 

 branchial nerve, or chief visceral nerve (of the left side), n. .x. Nerve 

 accompanying the vena cava which hes between this and the similar nerve 

 of the right side. gen. The left genital ganglion, u. sup. br. Anterior 

 branchial nerve, n. inf. br. Posterior branchial nerve, n. olf. Olfactory 

 nerve entering the left osphradium. ov. The oviduct (right side). 

 olf. p. p. The right osphradium. 



papilla or osphradium. This nerve supply is closely paralleled 

 in such Gastropoda as Ilaliotis. 



An examination of Octopus showed tliat in that Cephalopod a 

 similar distribution of visceral nerves obtains, but the branch 

 on each side corresponding to that which supplies the olfactory 

 papilla in Nautilus simply ramifies beneath the skin, there 



