1380 BOARD OF AGRICULTURE. 
-vaded, and those that are once attacked seldom or never re- 
cover. The same remarks, concerning the means of preven- 
tion, made under the preceding species, will apply equally to 
this. If neglected, these parasites increase with great 
rapidity, and thus the disease that they cause appears like an 
epidemic, in certain localities destroying hundreds or thou- 
sands of animals, while adjacent farms may be entirely free 
from it. 
The Strongylus of the Hog (Strongylus parodoxus Meblis). 
This is a slender, whitish or brownish worm, with a small, 
simple head. The mouth has three small papille. The 
cesophagus is long and muscular. The anus is situated some- 
what in advance of the posterior end of the body at the sum- 
mit of a small papilla. The male becomes half an inch or 
more in length, and has the caudal bursa bilobed, each lobe 
with five rays, the lateral ones divided. The female grows to 
the length of about an inch and a half, but is usually about 
an inch long ; the tail is terminated by a point, turned to one 
side; the genital opening is near the posterior end and a little 
prominent. This species is viviparous. It inhabits the wind- 
pipe, bronchial tubes, and lungs of swine. Its history and 
the effects it produces are nearly the same as those of the 
Strongylus filarta. 
The Strongylus of the Intestine of the Hog (Strongylus 
dentatus Rud.). 
This is a slender filiform species, about half an inch long, 
which lives in the small intestine, coecum, and colon of hogs. 
The head is obtuse and surrounded by six acute papille. The 
cesophagus is short and thick, muscular. In the male the 
tail is truncated and provided with an oblique bursa, formed 
of a single piece, strengthened by three subdivided rays ; 
there are two slender spicules. The tail of the female is 
elongated and slender, ending in a fine point; the genital 
opening is near the posterior end. 
The effects of this species and its history are little known. 
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