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. Public 
Health and Marine- Hospital Service, 
AND 
ALBERT HASSALL, M. R. C. V. S., 
Assistant in Zoology, Bureau of Animal Industry. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
I908. 
