TREASURY DEPARTMENT. • 
Public Health and Marine-Hospital Service of the United States. 
Walter Wyman, Surgfeon-General. 
HYGIENIC LABORATORY.-BULLETIN No. 17. 
?vl. J. Director. 
August, 1904. 
ILLUSTRATED KEY 
TO THE 
TREMATODE PARASITES OF MAN. 
CH. WTYRDELL SH ILKS. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1904. 
