THE H^MOFLAGELLATES. 



313 



of tlie chromatic band into rounded granules (chromosomes) first arranged in 

 one longitudinal row, and subsequently, by division, in two. The final division 

 of the cytoplasm is slow, and the two halves may remain united at one end 

 for some time before separating, thus giving the impression of transverse 

 division. 



Perrin regards the above form of the parasite as representing the " indiffe- 

 rent" type. In addition, he describes "female" forms and "male gametes;" 

 the latter result after a kind of maturation-process, large hernias being formed 

 at the side of the body, by means of which an expulsion of chromatic material 

 takes place. Lastly, a process of encystment is described in the "indifferent" 

 and " female " forms. 



Laveran and Mesnil came to the conclusion that this parasite is not a 



A. B. C. 



Fig. 64. — (a) Spirochseta plicatilis, Ehrenberg; (b) Spiro- 

 chajta refringens, Schaudinn ; (c) Spironema pallidum 

 (Schaud.). (After Schaudinn.) [In b the central axis (drawn 

 black) represents both endoplasm and nuclear core ; in a, the spiral 

 axis (also black) is the nucleus alone, the surrounding endoplasm 

 not being distinctly indicated iu Schaudinn's figure.] 



Trypanosome but a Bacterium allied to Spirochseta,^ in Ehrenberg's original 

 sense of the term (145) ; and, it may be here mentioned, Leger, who has recently 

 studied this organism, in a note to the writer expresses the same opinion. 

 On the other hand, Perrin is confident of the essential Trypanosome nature of 

 the parasite, and, while recognising its resemblance to Bacteria in nuclear 

 structure, etc., sees iu it a representative of the ancestral Hsemoflagellate, 

 somewhat on the lines of Schaudinn's bipolar " Urhsemoflagellate " (see foot- 

 note, p. 267). 



1 The correct way of spelling this name is Spirochseta, not Spiro- 

 chsete; vide Ehrenberg (1. c.). 



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