1. During 13 th to 15 th in October of the last year, we made the biological surveys in the hot springs of Ibusuki district.
2. The water temperature varies from 33°C to 67°C and the pH ranges between 5.6 and 7.4.
3. Forty-six species of various groups of animals were secured in the hot springs ranging from 33°-55°C of water temperature and the pH of 5.6 and 7.4.
4. Among these species, we found four newly recorded species such as Glaucoma pyriformis MÜLLER, Vorticella campanula EHRENBERG, Sternolophus rupifes FABRICIUS and Gobius giurinus RUTTER.
5. Two species, Frontoaia sp. and Euplotes patella EHRENBERG, occurring in the hot springs in Italy described by ISSEL, also existed in the hot springs investigated.
6. It is rather worthy to note that Nassula sp., Bleph, arostoma elongate UYEMURA and Cyclidium glaucoma MÜLLER live in the thermal water as high as 55°C of water temperature.
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