1) The document discusses the digestive system of the annelid Nereis. It has a complete alimentary canal divided into foregut, midgut, and hindgut. 2) The foregut contains the mouth, buccal cavity, and muscular pharynx lined with cuticle and armed with jaws. The midgut includes the oesophagus, stomach, and intestine where digestion occurs. 3) Nereis is carnivorous, feeding on small invertebrates using an everted pharynx with jaws. Digestion is extracellular in the midgut aided by enzymes from oesophageal glands. Undigested waste exits via the hind