

Figure 3 — Lacrymaria at rest. The debris in which it is concealed consists largely 

 of small filamentous and unicellular algae. Note the oral cilia folded over the 

 oral knob which contains the mouth. The cilia are much more numerous 

 than represented. The small circles represent contractile vacuoles, the globular 

 body the macronucleus. 



Figure 4 — A specimen with the neck fully extended. The dots in front of the 

 creature represent particles carried toward the mouth in a current produced 

 by the oral cilia. 



Figure 5 — An individual shortly after having swallowed a small protozoan which 

 is still lodged in the neck. 



Figure 6 — A sketch showing the neck bent on itself and the head in contact 

 with the body over which it passes apparently cleaning the surface. 



Figure 7 — An illustration of the manner in which the neck is often bent so as to 

 form sharp angles. 



Figure 8 — A free swimming specimen suddenly changing its direction of locomo- 

 tion by turning the head and neck sharply toward one side. 



