PARASITES OF PROTOZOA 



1071 



is soon emptied, and Colpodella takes on a stouter form and a green 

 color. The substance of its prey collects in a large digestive vacuole and 

 is absorbed. In multiplication, the organism rounds up and undergoes 

 thrice-repeated binary fission within a membrane, from which crescentic 

 flagellates escape. Thick-walled cysts were described by Dangeard. 



Hollande (1938) gave the name Colpodella raymondi to a parasite 

 found by Raymond (1901) on Chlamydomonas. The parasite, reported 



Figure 222. A, B, Bodo perforans Hollande, ectoparasitic on Chilomonas paramaecitwi ; 

 C, ectoparasite of Colpoda cucuUus. (A, B, after Hollande, 1938; C, after Gonder, 1910.) 



Raymond, occurs in one to several spheroidal masses on the surface of 

 Chlamydotnonas. Exceptionally there are more than a hundred; the usual 

 size appears to be very much less than that of C. pugnax. According to 

 Raymond, the host appears not to suffer from its presence, at least unless 

 the infection is very heavy. 



An interesting ectozoic organism on Chilomonas Paramecium was 

 named Bodo perforans by Hollande (1938). This flagellate possesses a 

 long, slender rostrum by which it is fixed in a constant position near 

 the anterior end of Chilomonas, at the base of the flagella (Fig. 

 222 A, B) . It has two unequal flagella, inserted at the base of the rostrum. 

 Rarely two or three parasites are attached to one host. The rostrum, 

 according to Hollande, penetrates the cytoplasm shallowly; and he found 



