206 
UNSEGMENTED “‘ WORMS.” 
Some of the most Important Forms Parasitic in Man. 
cotdes, Maw-worm 
(common). 
[A.mystax,com- 
mon in dogs and 
-| cats, has also been 
found in man.] 
intestine. 
ment has shown that 
infection results if 
the eggs (with their 
outer envelope en- 
tire) are swallowed 
along with vegetable 
food or otherwise. 
RESULT ON 
Name. PosiTIon. History. Host 
Ascaris lumbri- Usually in small Repeated experi- Commonest in 
children; rarely 
dangerous, unless 
very numerous, or 
wandering into 
other parts of the 
body, ¢.g. respira- 
tory tract, bile 
duct, vermiform 
appendix. Like 
others, it may 
puncture the wall 
of the gut and 
liberate pathogenic 
bacteria. 
Oxyuris vermi- 
cularis (common). 
Trichocephalus 
dispar or trichi- 
urus, the whip- 
worm (common). 
From stomach to 
rectum, mostly in 
colon. 
From food 
water. 
or 
Rarely more than 
discomfort. 
Colon ; more 
rarely appendix 
and small intestine. 
(Australia, China, 
India, Egypt, and 
Brazil). 
(80-100 mm.) in 
lymphatic glands, 
embryos in blood. 
Males rare (30-45 
mm.). 
quito. 
Anchylostomum | Small intestine. The larvae seem] Ulceration, he- 
duodenale (widely to live freely in the | morrhage, and dan- 
distributed). F _, | earth. Infection by | gerous anemia. It 
Rhabdonema| Associated with | ingestion or cutan- | was common in the 
strongyloides. Anchylostomum. | eously. workersattheMont 
Cenis Tunnel, and 
has occurred in 
Cornish mines. 
Filaria bancrofti| Mature female} Larve in a mos- 
Elephantiasis 
and hematuria. 
Dracunculus (Fil- 
The female is 1-6 
Larve in a Cy- 
Subcutaneous 
tine; embryos, pro- 
duced rapidly and 
viviparously, find 
their way to 
muscles, and be- 
come encysted. 
to man. 
aria) medinensis ft. long, encysts | clops. abscesses. 
(Guinea-worm), in| beneath skin, es- 
Arabia, Egypt, | pecially of back or 
Abyssinia, etc. legs. Male rarely 
seen. 
Trichina (Tri-| Becomessexually| From | ‘‘trichi-| Inflammatory pro- 
chinella) spiralis. | mature in the intes- | nosed” pig’s muscle 
cesses, often fatal, 
are brought about 
by the migration 
of the young worms 
from intestine to 
muscles. 
