ORGANS OF DIGESTION. 



371 



FIG. 121. 



infra-cesophageal ganglion which is connected by two nervous 

 bands with the broad supra-cesophageal or cerebral ganglion 



(12 1./.) The short 

 narrow oesophagus 

 (121. d.) passes 

 through the double 

 ganglionic ring (121 

 f. /".), and dilates 

 into a large mem- 

 branous crop or 

 curved sac (\2l.i.i.) 

 generally filled with 

 pieces of fuci. This 

 large crop or paunch 

 occupies the right 

 side of the abdo- 

 men and opens la- 

 terally into the 

 smallest or middle 

 stomach (121. k.) 

 which is provided 

 internally with nu- 

 merous broad, flat, 

 horny teeth of a 

 rhomboidal form, 

 which serve to com- 

 press the softened vegetable matter transmitted in small por- 

 tions from the first stomach. The third cavity (121. /.) of this 

 complex stomach is placed on the left side of the abdomen ; 

 it receives by several wide ducts placed in a valvular recess 

 at its pyloric orifice, the secretions of a large lobed liver 

 (121. o.) and of a long single pancreatic follicle; and its inner 

 parietes are furnished with several sharp horny spines to 

 subdivide the coarse food, or to pierce it for the ingress 

 of the solvent gastric fluids. % The intestine (121. m.) on 

 escaping from the third stomach forms several convolutions 

 round the lobed liver (121. o.), and after a lengthened course, 

 without forming any further enlargement or internal valve, 

 it opens on the right side (121. n.) near the posterior ex- 

 tremity of the body and immediately behind the heart (121. 

 q. r.) and the large pectinated branchiae (121. p.) As in 



B B 2 



