328 
MAYNARD M. METCALF 
EXPLANATION OF FIGURES 
39 a-c Division of a spore which has pulled in its flagella. In c one of the 
daughter cells is beginning to grow flagella, one having appeared. X 1700 di- 
ameters. 
40 a-c Attempted copulation of flagellospores. They drew in their flagella 
after touching one another. In c one of the individuals has already reformed one 
of its flagella preparatory to swimming away. X 1700 diameters. 
41 a-1 A prolonged but unsuccessful attempt at copulation. Time, thirty 
minutes. Observe the change of form of the two individuals. In k, one individ- 
ual has reformed one flagellum. Soon it formed a second and swam away. In 1, 
the remaining individual has reformed its flagella (one of these is apparently bent 
back under the body so as to obscure the fact that the two flagella protrude from 
opposite ends of the body). X 1700 diameters. 
42 a-f Successful copulation of two flagellospores. They drew in their flagella 
promptly upon touching. The flagellate condition was not drawn because the out- 
come was not forseen. X 1590 diameters. 
43-44 Amoeba sp. 
43 A gemmulating Amoeba of the smaller species. X 1700 diameters. 
44 Gemmules freed from such an Amoeba as that shown in fig. 43. X 1700 
diameters. 
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