According to the brachyuran specimens collected from the coastal seas of Korea during the period from 1969 to 1970, the following ten species were described briefly as hitherto unrecorded species from Korea: Family Calapidae: 1. Mursia curtispina trispinosa(Parisi); Family Corystidae: 2. Jonas distincta (de Haan); Family Portunidae: 3. Portunus (Monomia), argentatus (White); Family Xanthidae: 4. Neoliomer a insularis (White), 5. Acutumnus asper (Ruppell); Family Majidae: 6. Pleistacanta sanctijohannis Miers 7. Huenia proteus de Haan, 8. Scyra compressipes Stimpson, 9. Maja spinigera de Haan, 10. Entomonyx spino년 (Miers)