58 Elementary Biology. 



other and to the higher plants and animals. That form 

 Hceckel termed Protomyxa aurantiaca (fig. 8). Protomyxa 



FIG. %.*Protcmyxa aurantiaca. (Haeckel.) 



d c 



For explanation see text. 



exhibits four very different stages in its life-history, each of 

 which has a distinct significance. 



