428 



PROTOZOOLOGY 



changes and develops sporangia. The first indication of this process 

 is the appearance of lobular masses of protoplasm in various parts 

 of the body (/, g). These masses are at first connected with the stream- 

 ing protoplasmic thickenings, but later become completely segre- 

 gated into young sporangia. During the course of sporangium-for- 

 mation, foreign bodies are thrown out of the body, and around each 



Fig. 179. The life-cycle of the endosporous mycetozoan (de Bary, 

 Lister, and others), a, plasmodium-formation by fusion of numerous 

 myxamoebae; b, c, formation of sclerotium; d, e, germination of sclero- 

 tium and formation of Plasmodium; f, portion of a Plasmodium showing 

 streaming protoplasmic thickenings; g, h, formation of sporangia; i, a 

 sporangium opened, showing capillitium; j, a spore; k, germination of 

 spore; 1, myxamoeba; m, n, myxoflagellates; o-q, multiplication of 

 myxoflagellate; r, microcyst; s, myxamoeba. Variously magnified. 



sporangium there is secreted a wall which, when mature, possesses a 

 wrinkled appearance (h). The wall continues down to the substra- 

 tum as a slender stalk of varying length, and in many genera the end 

 of a stalk spreads into a network over the substratum, which forms 

 the base, hypothallus, for the stalk. With these changes the interior 



