A Ciliate Protozoan. 



A CILIATE PROTOZOAN 

 (Paramoscium caudatum). 



PREPARE slides in the same way as was directed for 

 Amoeba. If the animals have been fed for some hours with 

 carmine or Bismarck brown, the internal structure will often 

 be more clearly shown. 



Under the compound microscope the Paramcecia are seen 

 to glide rapidly about, lashing their way through the water 

 by means of innumerable cilia. Have they an anterior and 

 a posterior end ? Find an animal that is quiet, and see if 

 you can distinguish between an external membrane and the 

 enclosed granular cytoplasm. 



Are all the cilia of about the same length? Note their 

 arrangement along the edges of the opening that leads into 

 the animal from the side. This opening leads into the 

 vestibule. 



The vestibule is the ciliated passage down which food is 

 forced on its way to the cytoplasm. Is there a definite flow- 

 ing of the cytoplasm ? Are the contained food vacuoles dif- 

 ferent from those of the Amoeba ? The food-balls, after 

 losing their nutritious portions, are ejected from the body at 

 a point, the anus, situated a little way posterior to the vesti- 

 bule. 



Do you find pulsating vacuoles ? How many? What is 

 the outline in diastole ? In systole ? 



