HMMOPROTEUS COLUMBM 



5^5 



Hsemoproteus columbae Celliand Sanfelice, 1891. 

 Hcemoproteus'columbiS is the halteridium of Columha livia L. Its life- 

 history is not exactly known at present, but has been studied by Ed. and Et. 

 Sergent and by Aragao. According to the latter observer, it would seem to 

 have the usual two life-cycles of schizogony and sporogony joined into one, 

 taking place in Columha livia and in Lynchia maura or L. hrunea [lividicolor) 

 Oliv. 



/2. 



Fig. 185. — The Life-Cycle of Hcsmoproteus columhcB Celli and 



Sanfelice. 



(According to the researches of Aragao. After Aragao, from Archiv 

 /. Protistenkunde.) 



Starting with the macro- and micro-gametocytes, which are of the same 

 appearance as in H. noctucB, and which enter the gut of the Lynchia along 

 with the blood sucked from the pigeon, the usual processes of reduction, with 

 the formation of microgametes and macrogametes and ookinetes, and the 

 clearance of waste matter from these latter, are gone through. The further 

 changes undergone by the ookinete are at present unknown. 



After the Lynchia bites a pigeon, a small binuclear parasite is to be found in 

 a leucocyte, first at the site of the bite and later in the lungs, where the 

 further development takes place. First the small parasite divides into a 

 number of mononuclear forms, which, along with the leucocyte, grow 

 enormously, and form large parasites, at first full of nuclei, and later of 



