278 



MOLLUSC A. 



The mouth leads through the jaws into a buccal chamber 

 which contains a rasping odontophore of essentially the same 



AUmentarv ^^^^^^ ^^ ^^^^ ^^ ^^^ ^^^^^- ^ ^^^^ fr<^"^ ^ 

 pair of salivary glands opens into the buccal 



chamber. The oesophagus leads back some way to the 



stomachy a large rounded sac. From close to the junction 



of stomach and oesophagus the intestine passes forwards 



and downwards to the anus, and a small saccular ccecum 



opens at the same point. Here also open the paired ducts 



Fig. 196. — Ventral View of Sepia Officinalis with 

 Mantle-Cavity Cut Open. {Ad nat.) 



Siphon. 



Anus. 



Nephridiopore. 

 Mantle-flap. 



Facet. 



•Ctenidli 



Genital Aperture. 



Ink Gland. 



from the two digestive glands, large masses lying right and 

 left. The ducts are covered with masses of pancreatic cceca. 

 Close to the anus the intestine receives the duct from a 

 large ink-gland. The ink or sepia is ejected with the water 

 from the mantle and forms a dark cloud, behind which the 

 animal can beat a retreat. 



The prey is seized by the tentacles with their adhesive 

 suckers and is torn to pieces by the horny jaws and the 

 odontophore. The flesh is passed down the oesophagus 



