122 
Herpetomonas and Crithidia 
volutin granules conspicuous) suggests that volutin may be produced 
by the blepharoplast. 
In the rectum of some flies flagellates were found, which were 
obviously checked in the act of becoming post-flagellate forms 
(Diagram XII), because no complete post-flagellate stages were found. 
These forms showed peculiar changes of the normal structure such as 
hypertrophy of the nucleus and the blepharoplast (Figs. 1, 2), or 
premature division of these organella (Figs. 3, 4, 7). 
Sometimes the chromatic part of the blepharoplast w^as seen to 
divide and the surrounding achromatic substance was expelled, so that 
only two large chromatic bodies remained (Figs. 5-6). 
Some of the developmental forms of Herpetomonas vutscae-dornesticae, 
described by Prowazek (1904) as stages of “parthenogenesis” and 
“ etheogenesis,” bear a remarkable resemblance to these abnormal 
flagellates figured in Diagram XII. 
In Prowazek’s “ etheogenesis,” the “ male ” forms are stated to 
exhibit a degeneration of the nucleus, the blepharoplast is divided into 
four parts, the two pairs of blepharoplasts copulate and at last large 
plasmatic globules are produced, containing several blepharoplasts. 
Diagram XII. 
Degenerative changes of Herpetomonas calliphorae in the rectum. 
1. Hypertrophy of the nucleus. 
•2-4, 7. Premature division of the nucleus and the blepharoplast. 
5-6. Hypertrophy of the blepharoplast. Elimination of achromatic substance. 
