72 PROTOZOAN PARASITISM 



with direct extension to adjacent tissues, occasional 

 excursion to the liver, and rarely accidental metas- 

 tasis to other tissues. 



Fig. 12. — Amoebic Colitis. 



Group of Endamocha histolytica within the tissues between the 

 muscle coats of the colon. Photomicrograph x 475. 



Local extension deep into the wall of the intes- 

 tines is common in generalized colonic infection, usu- 

 ally with dysentery. Sometimes involvement of the 

 peritoneum allows bacterial invasion to this tissue 

 with local or general peritonitis but peritonitis is 



