THE SLIPPER-ANIMALCULE. 



169 



FIG. 87. Paramcetium caudatum. A, from the left side, showing the anal spot; B, 

 from the ventral side, showing the vestibule en face; arrows inside the body in- 

 dicate the direction of protoplasmic currents, those outside the direction of 

 water-currents caused by the cilia. 



an, anal spot; c.i\ contractile vacuoles; /r, food-vacuoles ; uu\ water vacuoles; m. 

 mouth; moo, macronucleus ; mic, micronucleus ; ce, oesophagus ; v, vestibule. Tne 

 anterior end is directed upwards. 



