抄録
1. The Japanese Gecarcinid fauna includes four species distributed into two genera (Gecarcoidea lalandii, Cardisoma carnifex, C. hirtipes, C. rotundum). 2. Gecarcoidea lalandii is known up to now only from the souther-most islands. The occurrence of Cardisoma rotundum is restricted to high rocky islands. C. carnifex and C. hirtipes occur as far north as Amami-Oshima. 3: The distribution border is apparently formed by the 20°C-Isotherme of sea-water in February, so that both species are expected to occur on Tokara-Gunto, too.
