PARASITOLOGY. 

 AscARis SuiLLA (Suis — hog) . 



101 



Synonyms. — Ascaris 

 Suis ; Ascaris Lum- 

 bricoides ; Ascaris 

 Suum. 



Distribution . — Very 

 common in the United 

 States; also found in 

 other countries. 



Desc7'iption. — 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 

 of the base ; the cau- 

 dal extremity of the 

 male is provided with 

 sixty to seventy papillae ; the male is seven to ten 

 inches long ; the female ten to twelve inches ; it is 

 oviparous; pinkish white in color. 

 Animal Infested. — The hog. 

 Parts Infested. — 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 



Fig. 36.— Ascaris Suis (a young one) 



a, Cephalic Extremity. 



b. Caudal Extremity. 



