DISEASES OF POULTRY. 



125 



a. 





The larger nodules contain a greenish -yellow necrot- 

 ic substance. The contents of the smaller nodules is 

 more purulent, while the smallest appear simply as an 

 area of infiltration. Microscopic examination shows 

 that the heads of the tapeworms have penetrated the 

 mucous membrane and 

 are situated in different 

 layers of the intestinal 

 wall. They are fre- 

 quently observed be- 

 tween the villi. The 

 heads are not readily 

 detected in the necrotic 

 mass contained in the 

 larger nodules but may 

 almost invariably be 

 seen in the smaller ones. 

 In some cases the tape- 

 worm can be traced 

 through the mucous 

 membrane to the nodule 

 in the muscular coat in 

 which its head appears. ^,. ^'^^"'i^'' ... 



r ifT. 2''. — If I A cross section of a nodule 

 The worms attached to coiitaininfraseciuestiiini situated in the 



outer or lontritudinal mu-cular layer, 

 the mucous membraneare circular layer of tUc muscular wall not 



affected), [h] A section showinj;- a tape- 

 USUally small, but larger worm and a necrotic mass within the 



muscular wall, [c] A portion of a cross- 

 OneS believed to be of the section of the intestine showintr the head 



of a tarieworm within the muscle and one 

 same species are found lyintr between the vilU with its head 

 _ resting on the basement membrane of 



in the intestinal con- the mucosa, mau-nlfied. 



tents. If the intestine is opened and the mucous sur- 

 face carefully washed under a stream of water, the small 

 worms are clearly observed hanging from the mucous 

 membrane. The nodules are most numerous in the 

 lowest third of the small intestine, but are occasionally 



