Issued February I?, 1909. 
U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ANIMAL INDUSTRY-BULLETIN NO. 39. 
A. D. MELVIN, Chief ok Bureau. 
INDEX-CATALOGUE 
OF 
MEDICAL All) VETERINARY ZOOLOGY. 
PART 22. 
[Authors: P to Pfeilsticker.] 
CH. WARDELL STILES, Ph. D., 
Consulting Zoologist of Bureau of Anitnal Industry ; Zoologist of U . S. Public 
Health and Marine-Hospital Service , 
A N I > 
ALBERT HASSALL, M. R. C. V. S., 
Assistant in Zoology, Bureau of Animal Industry. 
WASHINGTON: 
GOVERNMENT PRINTING \0 F F I C E . 
I909. 
