65 



i' . The internal labial tentacles of the right side. 



k. The origin, on the left side, of the muscle which protrudes the jaws. 

 /. The inner concave surface of the great shell-muscles, 

 m. The termination of the right muscle. 



11 . Orifices by which the vena cava communicates with the abdominal 

 cavity. 



0. The ej'e laid open. 

 p. The pedicle. 



q. The pupil, seen from within. 

 ?•. Tire cut-edge of the sclerotic, 

 s. 'The retina. 



t. The dark pigment deposited on its anterior surface, and lining the cax-ity 

 of the globe. 



1. The brain, or central commissure. 



2. 2. Tlae anterior suboesophageal ganglions. 



3. 3. The ophthalmic gangUons. 



4. 4. The posterior suboesophageal ganglions. 



5. 5. Tlie nerves of the digital tentacles. 



6. 6. The ner\-es of the external labial tentacles. 



7. 7. Tlie nerves bringing the labial ganglions into communication A\-ith the 



anterior suboesophageal ganglions. 



8. S. Tlie internal labial ganglions. 



9. The nerves of the internal labial tentacles. 



10. The olfactory nerves. 



11. Tlie infimdibular nerves. 



12. The origins of the lingual and maxillan,- nerves. 



13. The nen-es of the gi'eat shell-muscles. 



14. The •visceral nerves. 



1 5. The branchial nei'ves. 



16. The ^■isceral ganglions. 



17. The nerves ramifying on the vena cava. 



Fig. 2. The olfactory laminpe magnified and separated. 



Fig. 3. The brain of the Cuttle-fish. {Scepia officinalis, Linn.) 



k2 



