PARASITOLOGY. 139 
OESOPHAGOSTOMA INFLATUM (Stoma—mouth ; Inflated). 
Distribution.—Found in the middle west and south. 
L Descriftion.—The worm is thread- 
F like in calibre and white in color; the 
cephalic extremity is crooked, which 
gives the worm the appearance of a 
ey cane; the mouth is circular and pro- 
a | 
c ; : ok F : 
: vided with six prominent papillae ; the 
Fig. 48- 1 ; 4 
Le ae anterior extremity of the worm is pro- 
INELATUNM vided with a transparent, globe shaped 
: ae apparatus; this is followed by two 
c, Cephalic ex- lateral wings; the male is provided 
eo aa with a well developed caudal pouch, 
tremity. which gives the worm a cut-off appear- 
ance; it is provided with two long spicu- 
lae; the tail of the female terminates in a sharp 
point; the male is about three-fourths of an inch long, 
the female one inch. 
Lite Cycle.—The ova find their way to the ground 
through the feces; the animal becomes infested 
through the food or water that is contaminated by 
by the ova or embryo. Upon reaching the intestinal 
tract the embryos embed themselves in the muc- 
ous membrane, forming a cyst, where they proceed 
with their development; they reach maturity only in 
the intestinal tract. 
Animals Infested.—Cattle. 1 
Parts Intested.—Small and large intestines. 
Symptoms. Condition Produced. —Oftentimes cysts 
in the mucous membrane are so numerous as to 
thoroughly stud the surface of both small and large 
intestines; this interferes with digestion and absorp- 
tion and is a source of irritation; the adults in the 
