312 
could anything like an undulating membrane be made out; nor did the 
movement of the parasites suggest the presence of one, the body being 
held rigid and progression being in a straight or slightly zig-zag course, 
produced entirely by the vibrations of the flagellum. 
In the stained preparations, the shape of the body and the general 
morphology of the short forms agree entirely with the original descrip- 
Fig. 1—6. 
Fig. 13— 17. 
Fig. A. (All figs. are magnified about 2500 times linear.) All the parasites are from 
mosquitoes at the commencement of the hibernating period (autumn). 1—3, typical 
resting forms; 4, individual with very short spike-like flagellum; 5—14, active in- 
dividuals with the typical truncated or oval shape (grain d’orge); 10, a parasite under- - 
going division; 15, rather larger, stouter form; 16 and 17, herpetomonad (semi-herpe- 
tomonad) forms. Note the conspicuous granules in many of the parasites. 
tion of Léger, and with the account and microphotographs of this 
parasite given subsequently by Novy, Mc-Neal and Torrey’. The 
4 J. infect. diseases, vol. 4. 1907. p. 223, many pls. 
