344 H. S. DAVIS 



movable these processes are readily absorbed, and may later 

 be reformed. When the trophozoites are attached to the blad- 

 der epithelium the ectoplasmic processes usually cover the entire 

 free surface of the body, but after being placed on the slide the 

 processes are usually rapidly absorbed, until after a short time 

 they may disappear over the entire body. 



The trophozoites are attached to the epithelium of the urinary 

 vessels by a specially modified part of the larger end of the body. 

 The ectoplasm, which is here more abundant and probably denser 

 than on other parts of the body, forms irregular, thin, plate- 

 like processes (pseudopodia) which extend in between the outer 

 ends of the epithelial cells (figs. 61 to 64). Between the plate- 

 like psuedopodia are depressions which receive the free, rounded 

 ends of the epithelial cells. Although the trophozoites thus be- 

 come very closely applied to the epithelium, I have been unable 

 to find any evidence that the cells are injured thereby. This is 

 the more remarkable when we consider that in cases where the 

 parasites are very abundant almost the entire epithelium may be 

 covered with them. 



Often the trophozoites are more or less completely covered 

 with small granules and debris of various kinds. In some cases 

 almost the entire surface of the body is thickly covered with 

 extraneous particles, and even erythrocytes can occasionally 

 be seen clinging to it. This viscid character of the ectoplasm is 

 undoubtedly due to the short, bristle-like processes, since parti- 

 cles only adhere to the body where these are present. 



The ectoplasm is abundant, clear, homogeneous or faintly 

 granular and usually covers the entire body but is more abundant 

 around the enlarged basal- portion (figs. 56 and 60). The en- 

 doplasm is distinctly granular and, usually, more or less vacuo- 

 lated. Small fat globules are commonly present but may be 

 entirely absent in the smaller individuals, although abundant 

 in the larger trophozoites. In addition to the fat globules, 

 small, irregular, refractive granules are usually rather abundant 

 in the endoplasm. Occasionally a few yellowish crystals can be 

 seen, but these are never abundant and in the majority of in- 

 dividuals are entirely wanting. They are apparently similar 



