DIGESTIVE SYSTEM *The mouth is situated just above the tongue inside the buccal funnel leads into a large cavity. *The buccal funnel is a specialized cup-like depression which acts as a sucker. *Mouth can be closed or opened by the forward and backward piston-like movement of the tongue . *Buccal cavity communicates with two tubes,a dorsal oesophagus and a ventral respiratory pharynx. *The respiratory pharynx is a blind pouch,which bears 7 internal gill slits on each side. *A valve like structure,the velum ,prevents the passage of food into the respiratory tube. *There is no distinct stomach. *The oesophagous leads directly into a straight intestine by vulvular aperture. *Anterior part of intestine is dilated,representing the stomach. *The posterior end of the intestine is widened to form the rectum which terminates at the small anus in the cloaca. *Inside the intestine,a typhlosole is present which follows a spiral course and thus
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