Issued October 9, 1900. 
U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ANIMAL INDUSTRY— BULLETIN NO. 39. 
A. D. MELVIN, Chief of Bureau. 
INDEX-CATALOGUE 
OF 
MEDICAL AND VETERINAKl ZOOLOGY. 
PART 24. 
[Authors: R to Rizzo.] 
CH. WARDELL STILES, Ph. D., 
Con<^i4/fi?i<r Zoologist of Bureau 0/ Atiirnal Industry; Zoologist of U. 5. Public 
Health andMarine-Hospital Service, 
AXL> 
ALBERT HASSALL,M.R.C.V.S., 
Assistant in Zoology. Bureau of Animal Industry. 
OOCC^ fc N IS D£^ 
U.S. DtPO^ 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE, 
1909. 
