373 
two nuclei are usually very close together, situated often in the posterior: 
half of the body; the kinetonucleus is generally alongside of (opposite 
to) the trophonucleus, but it may be slightly in front of, or even behind 
the latter (cf: figs. 5, 18, 21, 23). As a result of this, the attached 
Fig. 18—22. 
Fio: 23-28, 
Fig. 29-38. 
è 
on 
Fig. B. (All figs. are magnified about 2500 times linear.) All the parasites are from 
mosquitoes after hibernation (in spring). 18, form with short, spike-like flagellum ; 
19—26, typical “crithidial” individuals; 27 and 28, transitional forms between the 
last and, 29—33, herpetomonad or semi-herpetomonad parasites. Note the general 
absence of conspicuous grains in the cytoplasm. 
portion of the flagellum is frequently of considerable length; even in 
such cases, however, it appears to be closely attached to the side of the 
body and I cannot note any indication of a membrane. In some indivi- 
