THE LEUCOCYTOZOA 265 



They pass a portion of their life as small, more or less vermi- 

 form or gregariniform bodies, enclosed within the host-cells, but 

 later they may become free in the plasma of the blood. Multi- 

 plication of the mammalian Leucocytozoa occurs in the internal 

 organs of the host {e.g. the liver, bone marrow, and lung). 

 Avian Leucocytozoa are said to exhibit sexual characters, but 

 this is somewhat doubtful. A sexual cycle of the mammalian 

 forms has only been described for Hepatozoon perniciosum 

 (L. muris) by Miller in a mite, and for L. canis by Christophers 

 in the dog tick. These sexual cycles need confirmation. It is 

 certain that lice spread L. musculi from mouse to mouse. 



Such is a general survey of a very interesting group, the 

 Leucocytozoa, which perhaps is not homogeneous, as the forms 

 in birds differ in some respects from those occurring in 

 mammals. This survey of the Leucocytozoa is the first that has 

 been attempted, and it is hoped that it may draw attention to, 

 and stimulate research upon, an interesting group of parasites 

 which are probably more numerous than we know at present. 

 They should be searched for among reptiles, amphibia, and 

 fishes. 



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