132 BOARD OF AGRICULTURE. 
penis is very slender. The female has a nearly straight, 
obtuse tail ; the anus is triangular, near the end; the genital 
orifice is anterior, near the mouth ; the ovaries and oviducts 
are simple, but long and convoluted. The intestine is large 
and blackish, with thin walls, and quite simple, running 
directly from one end of the body to the other, and is attached 
to the sides of the body, along its whole length, by fibres. 
Habits. 
This formidable parasite lives in the kidneys of man and 
various animals. It has been found in the dog, horse, cattle, 
hog, wolf, weasles, mink, otter, seal, glutton, raccoon, and coati. 
Tn this country it has been found quite frequently in the kid- 
Figure 81. 
neys of the mink. It has been found very rarely in the blad- 
der, in the abdominal cavity, and, it is said, in the heart. In 
man it is very rare. When lodged in the kidney it gradually, 
but completely, destroys the substance of the organ, which | 
becomes filled with purulent and bloody matter, upon which 
the worm feeds, while the walls often become hardened with 
calcareous deposits. The effects and symptoms are the same 
as in other acute diseases or abscesses in one of the kidneys. 
The only positive evidence of the presence of the worm would 
be the discovery of the eggs in the urine. It is probable that 
no remedy can be applied when the parasite is once lodged in 
the kidney. 
The history of this worm is not fully known. According 
to Leuckart, a slender worm found coiled up in cysts in 
the muscles and peritoneum of fishes is the young or larva of 
some species of Hustrongylus. The larval form referred to 
Figure 81.—Eustrongylus gigas, male, less than natural size; a, spiculum and 
bursa; , anus of female, enlarged. From Guerin. 
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