14 



NILS HJ. ODHNER 



walls, lined with high, thickly ciliated, cells. From the upper 

 part of this common trunk emerges the intestine (i), in its be- 

 ginning retaining the folds and the same epithelium as well as 

 showing a short typhlosolis on its dorsal side. The foremost 

 part of the intestine forms a simple curve towards above, then 



descends getting smooth 

 walls and smaller cilia at 

 its cells. Finally the intest- 

 ine passes backwards di- 

 rectly to the anus (a). It 

 ends with a rectum the 

 walls of which are folded. 

 The liver [l] is strongly 

 developed and richly divided 

 into lobes. It occupies more 

 than half the body, the 

 rear part of which is filled 

 with its median portion 

 communicating with the 

 stomach by means of the 

 posterior liver duct. Some- 

 what more above, there 

 open into this large trunk 

 some tubes on the left side 

 leading from the left liver 

 portion, which is situated 

 in the left side of the anterior body half, occupying the space 

 between foot and back. The posterior, and the left liver portions, 

 thus debouch by a common trunk into the stomach. Besides, 

 there exists on the right side of the body a smaller liver mass 

 situated above, and in front of, the genital opening, and separa- 

 ted by the intestine from the posterior liver portion. This 

 right liver mass opens by means of its own ducts {I. c.) 

 into the stomach, the upper walls of which pass into those 



Fig. 6. Anatomy of G- typica (cf. p. 



