PARASITES OF ANIMALS. 131 
The Strongylus of the Intestine of Sheep (Strongylus contortus 
Rud.). - 
This is a filiform species, tapering to both ends, but more 
slender toward the head, which is provided with two semi- 
elliptical, wing-like appendages ; the mouth with three small - 
papille. The male is about three-fourths of an inch long, 
_with a bilobed bursa, each lobe with about eight rays; the 
sheath of the male spicule is very long. The female sometimes 
becomes four inches long. 
It is not uncommon in the small intestine of sheep, but its 
history is very imperfectly known. When abundant it may, 
without doubt, cause serious trouble. : 
Strongylus filicollis Rudolphi. 
This species also inhabits the small intestine of sheep. The 
body is very slender and whitish or reddish. The head has 
two, very small, lateral, wing-like appendages. The male 
bursa is bilobed, each lobe with six rays. It is from a third 
to four-fifths of an inch long. 
Strongylus radiatus Rudolphi. 
This worm lives in the small intestine and colon of cattle 
and several otherruminants. The head is simple ; the mouth 
naked. The male is about half an inch long, with a bilobed 
caudal bursa, the lobes many rayed. The female is about 
three-quarters of an inch long ; the genital opening is near 
the tail. 
Its complete history is unknown. 
The Kidney-worm (Eustrongylus gigas Diesing). Figure 81. 
This is the largest of all the Nematode worms, the females 
sometimes becoming three feet long and half an inch in 
diameter, though usually much less. The body is smooth, 
cylindrical, tapering somewhat to each end, and more or less 
deeply tinged with red. The head is simple, obtuse. The 
-mouth is terminal and surrounded by six rounded, chitinous 
papille. The male becomes ten to twelve inches long and 
one-fourth of an inch in diameter; the caudal bursa is cup- 
shaped, circular and entire, without rays ; the male spicule or 
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