



o 







j 

 ^i 



2 = 



Issued October 9, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ANIMAL INDUSTRY. BULLETIN 158. 



A. D. M ELY IN, CHIEF OF BUREAU. 



;HE ROUNDWORMS OF DOMESTIC SWINE, 



WITH SPECIAL REFERENCE TO TWO SPECIES 

 PARASITIC IN THE STOMACH. 



BY 



WINTHROP D. FOSTER, 



Junior Zoologist, Zoological Division. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1912. 



