PARASITOLOGY. 101 
Ascaris SuILia (Suis--hog). 
Synonynts.—Ascaris 
Suis; Ascaris Lum- 
bricoides; Ascaris 
Suum. 
Distribution.—Very 
common inthe United 
States; also found in 
other countries. 
Description.—The 
head is small; the 
superior lip is pro- 
vided with two papil- 
lae, which are located 
at the lower angles; 
the two remaining 
lips are provided with 
one papilla each, lo- 
cated at the middle 
Fig. 36.—Ascaris Suis (a young one). of the base; the cau- 
a, Cephalic Extremity, dal extremity of the 
mleestiel Eepheenais male is provided with 
sixty to seventy papillae; the male is seven to ten 
inches long; the female ten to twelve inches; it is 
oyiparous; pinkish white in color. 
Animal Intested.—The hog. 
Parts Intested.—The.small intestines. 
Symptoms.—Large numbers cause various intes- 
tinal disorders, as indigestion, colic, diarrhoea and 
obstruction, followed by emaciation. Large num- 
bers always cause an unthrifty condition. If the 
worms ascend to the stomach they cause nausea and 
vomiting; if they enter the pancreatic duct they 
cause obstruction and inflammation of that part, and 
