346 H. S. DAVIS 



D). In several cases after being on the slide for some time they 

 became so irregular in shape that the body was divided into 

 two or more parts connected only by a small strand of proto- 

 plasm, and in two or three instances the parts were observed 

 to separate by moving in opposite directions until all connection 

 was destroyed (text figs. E to G). This is evidently a case of 

 plasmotomy but whether it occurs under normal conditions 

 I am unable to say. 



After being on the slide for several hours the branched, atten- 

 uated pseudopodia disappear and are replaced by a few rounded, 



Text-figures E to G Division of polysporous trophozoites after being on the 

 slide for some time. X 350. 



lobe-like pseudopodia (text fig. D), the trophozoites by this 

 time having become practically motionless. 



In a few cases a phenomenon was observed which is appar- 

 ently similar to that described by Cohn ('96) in Myxidium lieber- 

 kiihni, which he believed to be a method of reproduction. Several 

 of the largest trophozoites, after being placed on the slide for 

 some time, formed numbers of rounded, bud-like protuberances, 

 varying greatly in size, along the posterior part of the body 

 where the ectoplasmic hair-like covering was well developed 

 (fig. 58). These rounded processes were, in most cases at least, 

 composed entirely of ectoplasm. In a very few of the larger 

 processes a faintly granular central portion could be distinguished 

 which may possibly have been endoplasm. Many of the proc- 

 esses were observed to change their position on the trophozoite. 



