PROTOZOA 



133 



tant flagellate organisms which have been found, occasionally in 

 man in the aUmentary tract, and in necrotic material from the lungs. 

 Trichomonas is a pear-shaped organism which has four flagella at- 

 tached to its blunt end, and an undulating membrane extending from 

 the origin of the flagella at the anterior end posteriorly over the sur- 

 face of its body. One of the four flagella is usually directed 

 backwards and extends along the border of the undulating membrane. 



Fig 96 — Trichmonas eberthi, from the intestine of the common fowl;.///., 

 anterior flagella, three in number; P.fl., posterior flageUum, forming the edge of the 

 undulating membrane; chr. I., "chromatinic line," forming the base of the undulatmg 

 membrane; chr.b., "chromatinic blocks;" bl., blepharoplast from which all four 

 flagella arise; m., mouth opening; N., nucleus; ax., axostyle. {From Mtnchin, after 

 Martin and^ Robertson.) 



One species is sometimes found in the human bladder. Other species 

 are common, usually harmless, parasites in the intestines of pigs, 

 frogs and other animals. The most important species of the genus 

 Lamblia is Lamblia intesiimlis. It also is a pear-shaped organism. 

 It has several flagella and is distinguished by possessing a depressed 



