354 
Protozoa of Lizards, etc. 
None of the flies in the control experiment showed any infection. 
It is evident therefore that the flagellates taken up by the flies can survive 
for at least two days, and the character of the infections in the flies resembled 
a natural fly infection, but the fact that the flagellates eventually disappeared 
would seem to indicate that the house-fly is not the true host of the chamaeleon 
flagellate. 
Unfortunately time did not permit of the investigations being carried any 
further. 
Nomenclature. 
The flagellate of the chamaeleon is undoubtedly of the leptomonas type 
and it is of especial interest as being the only known leptomonas which is 
parasitic in the gut of a vertebrate. In addition to the flagellates of the gecko 
described by the French observers others have been recorded from verte¬ 
brates, apart of course from the well-known natural leishmania infections of 
man, dog and cat. The Sergents (1907) recorded their observation of a lepto¬ 
monas in the blood of the pigeon. Fantham and Porter (1915) say they saw 
a leptomonas in mice but Mesnil (1915) is doubtful of the correctness of this 
observation. Balfour (1916) also states that he and Archibald saw such a 
flagellate in the gerbil in the Sudan. Dutton and Todd (1902) claimed to have 
seen this flagellate in Gambian house mice (sp. ?), but in a subsequent exami¬ 
nation of the films Todd (1914) found the flagellate to be in reality a trypano¬ 
some which he identified with Trypanosoma acomys (Wenyon). Trypanosoma 
lewisi is a very active flagellate and occurs in such a variety of forms that 
when seen only in the fresh unstained blood it is quite easily mistaken for a 
leptomonas and it seems probable that the forms described by the various 
observers noted above were in reality Trypanosoma lewisi. In any case the 
descriptions are so meagre that it is impossible to identify the flagellates. In 
1919 Marcel Leger described a flagellate (a leptomonas) which he named 
L. Henrici from the blood of two out of thirty lizards (Genus Anolis, Fam. 
Iguanidae) examined in Martinique. The organisms were typical leptomonas 
forms measuring 15-16/x in length and 3-4/x in breadth. The flagellum was 
longer than the body. Rarely were rounded leishmania forms seen. He sub¬ 
sequently found that over half the lizards examined harboured what was 
apparently the same leptomonas in the rectum. It would appear, therefore, 
that the only cases of leptomonas infections of the blood and tissues of animals 
are those of the N. African gecko and the S. American Anolis. In 1909 Knuth 
recorded the finding of a leptomonas in the heart blood of a roebuck but, as 
the animal was partly devoured and had fly larvae in its lungs, the infection 
may have been of extraneous origin. 
On the other hand, it has been demonstrated, chiefly by Laveran and 
Franchini and Fantham and Porter, that many insect flagellates of the lepto¬ 
monas and crithidia types are inoculable into mice and other animals and 
even bring about their death. These inoculation experiments are of the greatest 
interest from the point of view of the spread of leishmaniasis, and the French 
