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C. GORDON HEWITT. 
non-flagellate end of the body. No conjugating forms were 
found, nor any wandering into the ovaries. 
Lingard and Jennings (1. c.) describe certain flagellates of a 
flag-shaped or rhomboidal nature, which I am strongly of the 
opinion are species of Crithidia and not species of Her- 
petomonas. Closely following Prowazek’s account of H. 
muscse-domesticae they describe and figure all their forms 
as having two flagellae in the flagellate stage. If one allows 
for the rupture of the flagellum from the bodies of the 
organism in making the film, some of their figures are not 
unlike those of Crithidia gerridis, parasitic in the alimen- 
tary tract of an Indian water-bug, Gerris fossarum Fabr., 
and described by Patton (1908). 
2. Nematoda — Habronema muscie (Carter). 
Carter (1861) appears to be the first to have described 
a parasitic worm in M. domestica. He described a bi- 
sexual nematode infesting this insect in Bombay, and found 
that ; “ Every third fly contains from two to twenty or more 
of these worms, which are chiefly congregated in, and con- 
fined to, the proboscis, though occasionally found among the 
soft tissues of the head and posterior part of the abdomen.” 
His description of this nematode, to which he gave the name 
Filaria niuscee, is as follows: “Linear, cylindi’ical, faintly 
striated transversely, gradually diminishing towards the 
head, which is obtuse and furnished with four papillae at a 
little distance from the mouth, two above and two below ; 
diminishing also towards the tail, which is short and termi- 
nated by a dilated round extremity covered with short spines. 
Mouth in the centre of the anterior extremity. Anal orifice 
at the root of the tail.” He gives the length as being one 
eleventh of an inch and the breadth as one three hundred and 
thirteenth of an inch. In his description of his figures of the 
worm he calls what is evidently the anterior, region of the 
intestine the “liver.” Von Linstow (1875) described a small 
nematode, wdiich he calls Filaria stomoxeos-, from the 
