PHYLUM ANNULATA 



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segments. At the sides of the oesophagus, in each of the segments 

 ten, eleven, and twelve, is a pair of rounded projections. The 

 first pair the oesophageal pouches are hollow, and their cavities 

 are in communication 

 with the lumen of the 

 oesophagus (oes. gl). The 

 other two pair s t h e 

 calciferous glands --are 

 thickenings of the wall of 

 the oesophagus, the fluid 

 in the interior of which 

 is milky, owing to its 

 containing numerous par- 

 ticles o f carbonate o f 

 lime; the numerous 

 small cavities which they 

 contain are in communi- 

 cation with the oesopha- 

 geal pouches. Poste- 

 riorly the oesophagus is 

 continuous with a 

 rounded thin-walled 

 chamber, the crop (cr), 

 and this is followed by 

 a very thick - walled 

 chamber, also of rounded 

 form, the gizzard (giz). 

 From this the intestine 

 (int) extends throughout 

 the rest of the length of 

 the body to the anal 

 aperture. It is wide, with 

 thick but soft walls, con- 

 stricted opposite the 

 septa, i.e. in the intervals 

 between the segments. 

 Running along the 

 middle of its dorsal sur- 

 face is a longitudinal 

 fold, the typhlosole (Fig. 

 365, typh), projecting 

 downwards into the 

 lumen. On the wall of the 

 intestine outside the muscular layers and surrounding the intestinal 

 blood-vessels are a number of granular, yellow cells the chloragen 

 cells (hep) : these are specially abundant in the typhlosole. The ter- 

 minal part, situated in the last segment, is termed the rectum. 



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