36 



ENTOZOA FOUND IN MAN. 



sucker is situated at a triangular orifice, very near 

 to the other ; a ramified intestine is distributed 

 throughout the entire body, Pig. 7.^ 



although it sometimes appears 

 to be absent in parts, owing to 

 its contractibility. The embiyo 

 of this species is unknown. 



The distomum hepaticum 

 belongs especially to ruminant 

 animals, in which it is most 

 frequently found, but it is one 

 of the very limited number of 

 species of worms which can live 

 in animals of very different 

 nature. It has been observed 

 in man, and in numerous domes- 

 tic and wild animals. 



It usually inhabits the gaU-bladder and the biliary 

 passages, but it is not entirely confined to those 

 parts ; it has been met with in the intestines, and it 

 has also been seen in the blood-vessels in man, and 

 even in inflammatory tumours situated beneath the 

 skin ; it is probable that it never arrives at the adult 

 state in the latter situations. 



Distomum Lanceolatum. 



This parasite, which attains to about one-third 

 only of the dimensions of the distomum hepaticum, 



^ Fig. 7. — A distomum hepaticum, magnified, a, the buccal 

 sucker; l, the abdomidal sucker; c, the oesophagus ; d,d,d,t\ye 

 ramifications of the intestine ; they are not visible throughout 

 their whole length, in consequence of their contraction. 



