THE SLIPPER-ANIMALCULE. 



169 



VX=: *. : {iS&.'' ''' .".'" '' '*' . :: 



I 



^^PvV-^ : .- ; V^xM 



; ; ^-IIV::'"; ;^fc ; .; :^M 



>r 



FIG. 87. Paramoecium cauclatum. A, from the left side, showing the anal spot; I?, 

 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. 



mi, anal spot; c.r, contractile vacuoles ; /r, food-vacuoles ; ir.r, water vacuoles; m t 

 mouth; iar, macronucleus ; wi'r, rnicronucleuG ; 02, oesophagus ; r, vestibule. The 

 anterior end is directed upwards. 



