thereto, as intermediate stages exactly similar in the formation of 
these bodies are seen in stained preparations of the heart, lungs, 
and spleen (Plate XXVII, figs. 1-5). 
However, in the peripheral blood there occur rounded, oval or 
somewhat pyriform parasites (figs. 17-20), each with a single 
anterior flagellum. Such forms may, for convenience, be called 
rounding herpetomonad forms, as Herpetomotias passes through 
similar stages in assuming a rounded non-flagellate form. The 
rounded stages of Herpetomotias , thus formed, have been aptly 
termed post-flagellate stages by Captain Patton and by Dr. Annie 
Porter in their recent interesting researches on flagellates {Crithidw 
and Herpetomotias'). The rounded, encapsuled stages of 
trypanosomes are post-flagellate stages. That these rounded, 
post-flagellate forms are encapsuled in a thin membranous structure 
is shown by the fact that they resist maceration in water much 
longer than the trypaniform flagellates. 
1 he formation of post-flagellate bodies (figs. 2, 3, 5) is well 
seen in the lungs, whence they find their way in the blood stream to 
the spleen and bone marrow. 
THE STRUCTURE OF LATENT BODIES 
I he post-flagellate (latent) stages of T. gambietise and T- 
rhodesiense , already mentioned, have a relatively simple structure. 
1 he strictly latent or non-flagellate forms are usually oval in 
outline, and small, about 2 // to 4 // in diameter (figs. 2-16). Less 
frequently are they quite rounded or spherical (fig. w ^' 
sometimes they are pyriform (figs. 25, 27, 29, 30). Internally there 
is a nucleus, which may show a karyosome, and beside the nucleus 
thcio is a blepharoplast or kinetonucleus (fig. 6). In some later: 
bodies, especially the smallest ones, the kinetonucleus may not be 
visible separately (figs. 11, 13-15), as it may be lying over the nucleus, 
"i actually affixed thereto (figs. 2, 10). The juxtaposition of the 
nuclear bodies has been actually observed in some Romanowsky- 
stained specimens, after careful wet fixation (figs. 2, 10). The 
lelative positions of the nucleus and blepharoplast in rounding o r 
rounded bodies may vary considerably. A small quantity of 
cytoplasm occurs in the latent bodies. 
