r -\A:^\ 
Issued July 8, 1908. 
U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ANIMAL INDUSTRY-BULLETIN NO. 39. 
A. D. MELVIN, Chief of Bureau. 
INDEX-CATALOGUE 
MEDICAL AND VETERINARY ZOOLOGY. 
PART 21. 
[Authors: to Ozzard.] 
CH. WARDELL STILES, Ph. D., 
Consulting Zoologist of Bureau of Animal Industry; Zoologist of U. S. Pu'.tic 
Health and Marine-Hospital Service, 
AX I) 
ALBERT HASSALL, M.R.C.V. S., 
Assistant in Zoology, Bureau of Animt 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
I 908. 
