29. 



EXCEETOKI ORG^TS. 

 Figures 4-. and 23. 

 In tlie adult aninal the excretory organs are very exten- 

 sive. They consist of many loops, the walls of -vfliich are mucli 

 sacc^^lated. They lie ventral to the pericardiim arid are con- 



tinued into the foot along the posterior side of the stomach, 

 figure 4, ex. ^Ji^ .^^.^.^.^.^^ , ^;^:^-^«:^3.^^=^U^ , .^^c^-^U^^ ^ ^^^.^ 



Figure 23 is a drawing of a wax inodel of the 'ends of 

 the left excretorjr orgaa and genital duct, seen from the -^rentral 

 side. 



The inner end, i- e, opens into the pericardium -ef 

 ■^ife^e h a - Borti o n of — the-w-al4 , p c, is shown , by a rather large open- 

 ing, turns abruptly towards the middle line of the body, crosses 

 the outer end, o'~^e, and is continued anteriorly close to the 

 pericardium. After passing through the many sacculated loops 

 already mentioned, the tube again comes near the pericardial ^irall, 

 enlarges, runs alongside the anterior i^um of the inner end, nar- 

 rows down again and opens into the mantle chamber through an 

 an antero-posteriorly elongated opening, mco, just posterior to 

 the point where the outer and inner ends of the tube cross. 



