MOLLUSCA 21 
wal 
ventral body-wall to the anus. A pair of small salivary 
glands le on either side of the oesophagus just behind the 
cartilaginous skeleton of the head; their two ducts unite into 
a single channel, which opens into the buccal mass in the 
neighbourhood of the radula. 
The liver is of considerable size; it is bilobed, and the 
anterior end of each half reaches as far forward as the salivary 
glands; the duct of each lobe arises about its middle, and 
runs back parallel with the oesophagus, to open into that part 
Fic. 126.—Diagram representing a vertical, approximately median antero-posterior 
section of Sepia officinalis. From a drawing by A. G. Bourne. After 
Lankester—Zoological Articles reprinted from Encyclopedia Britannica. 
1. Mouth. 11. Lumen of siphon. 
2. Upper beak. 12. Branchial heart. 
3. Lower beak. 13. Appendage of branchial heart. 
4. Odontophore. 14. Viscero-pericardial aperture. 
5, Nerve ring. 15. Renal glandular mass. 
6. Oesophagus. 16. Left ctenidium. 
7. Crop. 17. Subpallial chamber. 
8. Gizzard. 18. Valve in siphon. 
9. Anus. 19. Afferent branchial vessel. 
10. Cuttle bone enclosed by a growth of 
the mantle. 
of the intestine just behind the stomach which gives oft the 
eaecum. The bile ducts are enwrapped by the unpaired 
diverticulum of the nephridia, and this, where in contact with 
them, developes spongy excretory tissue, the so-called pan- 
creatic caeca. The ink bag lies to the right of the stomach, its 
duct runs parallel to the rectum, and opens to the exterior. 
Its secretion forms a pigment named after the animal, and 
by the expulsion of this the surrounding water is made inky, 
and thus serves as a screen to cover the escape of the squid. 
The coelom of Sepia contains the stomach, the heart with 
