MOLLUSC A 



215 



ventral body-wall to the anus. A pair of small salivary 

 glands lie on either side of the oesophagus just behind the 

 cartilaginous skeleton of the head ; their two diicts 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 



Fig. 126. — Diagram representing a vertical, approximately median antero-posterior 

 section of Sepia officinalis. From a drawing by A. 6. Bourne. After 

 Lankester — Zoological Articles reprinted from Sncydopmdia Britannica. 



of the intestine just behind the stomach which gives oft the 

 caecum. 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 



