154 . ENTOZOA FOUND IN MAN. 



enlargement of the Kver may be observed, and in a 

 few cases bile has been known to be mixed with the 

 expectorated matter. 



Chapter XXL 



HYDATIDS DEVELOPED IN THE ABDOMINAL 

 VISCEEA. 



Hydatids have never been found free within the 

 peritoneum, unless they had been previously deve- 

 loped in a cyst which, after its rupture, had discharged 

 its contents into the peritoneal cavity. The hydatids 

 which exist in the abdomen are developed in the 

 substance of one of the abdominal viscera,, or else in 

 the sub-serous areolar tissue ; in the latter situation, 

 the cysts are frequently multiple ; hydatids are more 

 common in the liver than elsewhere. 



As a rule, these hydatid tumours pass through 

 all their stages of growth in the part where they are 

 primarily developed ; but, sometimes, either as a 

 result of accident, or in consequence of its large size, 

 the cyst is ruptured, and its contents are discharged 

 into some other viscus, or else externally, owing to 

 the perforation of the abdominal parietes. 



The general observations which have been made 

 upon hydatids in a former chapter are especially 

 applicable to vesicular worms in the liver, and it will 

 therefore only be necessary to point out certain pecu- 



