The authors wish to express their sincere appreciation to Dr. J. E. Hazel and Miss E. E. Compton of the U.S. Geological Survey, Reston, Va., U.S.A., and Prof. Masuoki Horikoshi, Dr. Itaru Hayami, Dr. Kiyotaka Chinzei, Dr. Tomowo Ozawa, Dr. Toshiyuki Yamaguchi and Mr. P. M. Frydl of the University of Tokyo, for giving us prompt help at several stages in the preparation of this manuscript.

This checklist of Ostracoda from Southeast Asia is an extension of our previous work: The checklist of Ostracoda from Japan and its adjacent seas. We should also like to express our sincere appreciation to Professor K. G. McKenzie of the Riverina College of Advanced Education, Wagga Wagga, Australia who initiated this series of taxonomic works by suggesting that we undertake preparation of the checklist of Japanese Ostracoda. We should like to express our gratitude to Dr. D. Kadar of the Geological Survey of Indonesia, Bandung, Indonesia who went through the type collections at the Geological Museum of Bandung for us, but unfortunately could not find LeRoy's type specimens. We also wish to thank him for sending a copy of the rare Natuurkundig Tijdschrift number, published in 1940 just before the outbreak of the World War II.

This survey was supported in part by the Grant-in-Aid for Co-operative Research of the Ministry of Education, Science and Culture, project no. 434042.