158 PROTISTS AND DISEASE 



Copromyxa (Zopf) would seem to be a variety of Guliu- 

 Una : both are of milky aspect and produce sessile round, 

 or club-shaped colonies, Fig. 45, 3. 



Sappinia pedata (Dang), Fig. 45, 7 and 2, affords the 

 simplest example of this type of organism : the amoebulae 

 become encysted separately, on straws and the like. They 

 do not appear to form a pseudo-plasmodium. 



In Acrasis the amoebulae form a vertical row. The 

 lower and larger cells are transformed into thick-walled 

 strongly adherent cellulose cubes full of clear liquid, the 

 rest of the amoebulae arrange themselves in chaplet-form 

 at the upper end and become spores. 



In Dictyostelium a similar differentiation takes place 

 but the supporting cellulose column, Fig. 44, 2, may be 

 composed of many rows of cells. De Bary compares the 

 stalk of Dictyostelium to that of Stemonitis. 



Dictyostelium and Polysphondylium (Brefeld) differ only 

 in that the stalk of the latter, Fig. 45 : 5, a, 6, c, d, is 

 branched. 



I have not been able to find living examples of this group. 

 The impression left by reading accounts of Acrasieae is that 

 much more remains to be learnt about them. 



