160 Transactions. — Zoology. 



Plate VII. — Alimentcmj and Nervous Systems. 

 Fig. 1. Sketch of Alimentary and main portions of Nervous System. 

 a, inner lip. 



0, buccal mass. 



c, oesophagus. 



d, nerve collar. 



e, optic ganglion. 

 /, liver. 



g, ganglion stellatum. 



h, intestine, ending in anus with lateral anal valves. 



i, ink-sac. 



h, pancreatic glands, along the course of the hepatic duct. 



1, splanchnic ganglion, 

 m, stomach. 



n, ccecum. 

 Fig. 2. Mandibles. 



a, anterior or upper. 



b, posterior or lower. 



Fig. 3. Buccal mass cut open and mandibles removed. The point of the curved needle 

 is inserted in the oesophagus. 

 a, taste organ. 

 I, odontophore, turned aside. 



c, socket of odontophore. 

 d,d, faucial follicles. 



Fig. 4. Portion of pancreatic gland, drawn from the 1 in. objective with the camera 

 lucida. 



Plate VIII. 

 Fig. 1. Gladius. 



2. Cephalic cartilage. 

 3, 4. Neck cartilage, posterior and anterior aspects ; showing attached muscular 



bands. 

 5-9. Sections through 1st, 2nd, 3rd, and 4th right arms and clavate portion of 

 tentacle. The dark line shows the extent of the chromatophoric surface. 



10. A single sucker. 



11. Section of the same. 



12. An otolith, natural size, on dark ground. 



13, 14. View of both surfaces of an otolith, much enlarged. 

 15. The funnel cut open. 

 i, the infundibular valve. 



