1026 



PARASITES OF PROTOZOA 



from 1.5 to 22 n (Fig. 215B). Penard found that all the rods were 

 divided by equidistant transverse partitions, usually into two or three sec- 

 tions. Gould (1894) (Fig. 21 5 A) noted their division into from two 

 to sometimes as many as nine sections; and later (1905), under the name 

 of Veley, she observed transverse fission of the rods. Veley stated that 

 when the rods are set free from the cytoplasm, they are capable of in- 

 dependent movement, of a kind associated with the presence of flagella. 



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^P^"-,*^^ 



A 



3 



Figure 215. Bacteria {Cladothrix pelomyxae Veley, and a small species) in Pelomyxa 

 pdustris Greeff. (A, after Gould, 1894; B, after Leiner, 1924.) 



though none were demonstrated. This movement was at first rapid, and 

 could readily be distinguished from Brownian movement. Leiner ob- 

 served no independent movement. 



Attempts to cultivate the rods have given inconclusive results. Though 

 Veley (1905) cultured in sheep's serum, inoculated from washed 

 Pelomyxa, rods which she considered to be identical with those in the 

 cytoplasm, Leiner (1924) concluded that the amoebae cannot be cer- 

 tainly freed of foreign bacteria, and that the sources of error are too 

 great. 



Veley (1905) named the organism Cladothrix pelomyxae, noting its 

 resemblance to the two existing species of Sphaerotilus, of which genus, 

 according to Buchanan (1925), Cladothrix may probably be regarded 

 as a synonym. 



The rods are generally aggregated in proximity to the nuclei and 

 refractile bodies (Fig. 215A). Penard (1902) noted that in certain 



