688 H. M. WOODCOCK. 



of broad or ovoid massive foi-ras in this series was probably 

 due to a greater growth activity than was usually met among 

 the cultural parasites. And just in this case, it is interesting 

 to note, I have found not infrequently various stages of 

 division in ovoid or rounded individuals (cf . figs. 121, 123— 

 125). Making allowance for slight differences due to the 

 more massive form, the process appears to follow, in the main, 

 the unequal method of fission. In all these forms, whether 

 dividing or single, it may be as well to state, the flagellum 

 was present ; none of them showed any signs of absorbing or 

 otherwise losing this organella. 



The next type of cultural form of the parasites which I 

 have to describe is quite distinct from the preceding ones, 

 being markedly trypaniform. By the term trypaniform is 

 understood the condition characteristic of a trypanosome, 

 where the kinetonucleus lies much nearer to the aflagellar 

 end of the body than does the trophonucleus, and where, 

 consequently, the flagellum is attached by an undulating 

 membrane along the greater part of the length of the body. 

 In ray cultures I have found trypaniform phases, differing 

 slightly in character, at two different periods of the develop- 

 ment. As regards one case, I came across this type of the 

 parasites rather accidentally as it were, in the following 

 manner. I inoculated culture-tubes from the chaflBnch which 

 had a strong halteridial infection, in addition to small forms 

 of Trypanosoma fringillinarum, in the peripheral circu- 

 lation. These culture-tubes were examined much earlier 

 than it was my custom to do, namely after forty hours had 

 elapsed. This was not on account of the trypanosomes, as 

 I knew from former experiences that at this early period 

 they would probably not have multiplied sufficiently for me to 

 be able to find an individual on a smear without prolonged 

 searching ; it was because I wished to see what development, 

 — if any — was undergone by the halteridia in the culture.^ In 

 examining a good living drop to see if I could find any halte- 

 ridial ookinetes, I noticed one or two trvpanosomes which 



' See below, p. 727. 



