COMPLEX APPARATUS FOR NUTRITION. 



93 



263 



264 



an indefinite time : this arises from the circum- 

 stance that the caecal portions of the stomach are 

 laid open, so that the blood received into that 

 cavity flows out as fast as it is swallowed. 



A structure very similar to that of the leech is 

 met with in the digestive organs of the Glossopora 

 tuherculata, (Hirudo complanata, Linn.) of which 



Fig. 263 represents a mag- 

 nified view from the upper 

 side. When seen from the 

 under side, as is shown in 

 Fig. 264, the cavity of the 

 stomach is distinctly seen, 

 prolonged into several cells, 

 divided by partitions, and 

 directed towards the tail 

 The two last of these cells (c c) are much longer 

 than the rest, and terminate in two blind sacs, 

 between which is situated a tortuous intestinal 

 tube.* 



* In both these figures, t is the tubular tongue, projected from 

 the mouth. In Fig. 263, e are the six eyes, situated on the extre- 

 mity which corresponds to the head; and a double longitudinal row 

 of white tubercles is also visible, extending along the back of the 

 animal. £, in Fig. 264, is the entrance into a cavity, or pouch, 

 provided for the reception of the young. See Johnson, Phil. Trans. 

 for 1817, p. 343. 



