PARASITOLOGY. 139 



Oesophagostoma Inflatum (Stoma— mouth ; Inflated). 

 Distribution.— YoViXid. in the middle west and south. 

 Description.— "^^i^ worm is thread- 

 like in calibre and white in color ; the 

 cephalic extremity is crooked, which 

 gives the worm the appearance of a 

 cane ; the mouth is circular and pro- 

 vided with six prominent papillae ; the 

 Fig. 48 anterior extremity of the worm is pro- 



""Tp^"™"" vided with a transparent, globe shaped 

 a,'Maie. apparatus ; this is followed by two 



c;?eThaHc ex- lateral wings; the male is provided 

 tremity. with a wcll developed caudal pouch, 



tremity.^"'^''^ ^^ which givcs the worm a cut-ofif 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. 



Life Cycle.— The ova find their way to the ground 

 through the feces; the animal becom.es 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. 



A7iinials Infested.— ^2X\\e. 

 Parts /;^/^J/^^.— Small and large intestines. 

 Symptoms. Condition Produced.— Oi\.exi\:mie^ 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 



