^rH.V.^ 
Issued February 13, 1909. 
U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ANIMAL 1NDUSTR Y— BULLETIN NO. 39. 
A. D. MELVIN, CfliBF oi Bureau. 
INDEX-CATALOGUE 
MEDICAL AND VETERINARY ZOOLOGY. 
PART 22. 
[Authors: P to Pfeilsticker.] 
CH. WARDELL STILES, Ph. D., 
Consulting Zoologist of Bureau of Animal Industry; Zoologist of U. S. Public 
Health and Marine-Hospital Service, 
ALBERT HASSALL, M. R. C.V. S., 
Assistant in Zoology, Bureau of Animal 
WASHINGTON : 
GOVERNMENT PRINTING OFFICE. 
I909. 
