SECT. I 



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 ofl'. 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 





'^ 



, \ 



IIV 



Fio. 58. — Choiidrioderma difforme. «, Dry, slu-ivelled spore ; b, swollen si)ore ; and d, spores 

 showing escaping contents ; c, f, g, swarm-spores ; h, swarm-spore changing to a niyxamoeba ; 

 i, younger, k, older niyxanioebae ; I, myxamoebae about to fuse ; m, small Plasmodium ; 

 11, portion of fully-developed Plasmodium, (a-m, 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 8 warm-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 



