128 ZOOLOG ¥. 
while the male is unknown. The worm lives in the con- 
nective tissue under the skin, especially of the extremities. 
As the body of the female is full of young, the worm has to 
be carefully and slowly extricated, so as not to be broken and 
cause the embryos to be scattered under the skin of the host. 
Carter regards a small worm (Urolabes palustris) frequent in 
brackish water, as the immature form of the Guinea-worm. 
It is also believed that the embryos enter the bodies of water- 
fleas (Cyclops, etc.), and there moult, and that consequently 
they may be introduced into the body by drinking standing 
water ; but this has not been proved. Other species live in the 
peritoneum of the horse and apes, and an immature species 
(Filaria lentis) has been found in the lens of the human 
eye. Filaria sanguinis-hominis is a worm of microscopic 
size found living in the blood of the mosquito in India and 
China. It is said that the eggs are swallowed in the water 
drunk by man, are hatched in his intestines, and obstruct 
the smaller blood-vessels, causing, it is claimed, various 
forms of elephantoid disease, perhaps even leprosy. The 
mosquito sucks up the parasite in the blood of leprous pa~ 
tients, voiding the eggs in the pools it frequents. Filaria 
hematwa has occurred in the blood of the fostus of a dog 
whose heart was filled with them. ars of wheat are 
often infested by a minute Nematode (Tylenchus scandens 
Schneider, Angwil- 
lula tritict of Need- 
ham, Fig. 88). 
Other species live in 
flowers, moist earth, 
and sour decaying 
substances. Anyzwil- 
lula aceti Ehren- 
berg is from one to 
two millimetres in 
length, and lives in 
Fig. 88.—Young Wheat-Worm, greatly magnified. ..; a 
a, sec ie of “cheat” ee some wormsand multi; VINCgar. 
tudes of egyzs, magnified : b, an egg contaming a worm 
ready to hatch. —From Curtis, after Bauer, 7 The genus Cheto- 
soma lives free in 
the sea, and has a broad swollen head beset with fine hairs. 
It upparently connects the true Nematodes with Sagitta. 
