MORPHOLOGY 



55 



in which lies a central nucleus, and are surrounded by resistent cell 

 walls. The spores germinate in water, their contents, breaking through 

 the spore walls, come out (c, d) and round themselves off. A change 

 of form soon takes place ; the protoplasmic mass elongates and assumes 

 somewhat the shape of a pear, with the forward end prolonged into a 



FIG. W.Clwtuli-ioderma di/ornte.. a, Dry, shrivelled spore; l>. swollen spore; c and </, s[>oics 

 showing escaping contents ; , /, g, swarm-spores ; h, swarm-spore changing to a myxoamoeba ; 

 i, younger, k, older myxoamoeba; I, myxoamoebae about to fuse; m, small plasmodiuiu : H, 

 iwrtion of fully-developed plasmodium. ('<-, x 540: n, x 90.) 



fine whip-like process or flagellum (e, f, g). Thus the contents of the 

 spore have become transformed into a SWARM-SPORE, which now swims 

 away by means of whip-like movements of its flagellum. In addition 

 to the nucleus, which is visible in the anterior end of every swarm-spore, 

 a vesicle may be seen at the other end, which, after gradually increas- 

 ing in size, suddenly vanishes, only to swell again into view. This 



