3 species of Cladocera belonging to the genus Diaphanosoma S. FISCHER, 1850, are described and figured. Diaphanosoma ezoensis and Diaphanosoma nipponica are new species.

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In order to obtain information and an international perspective, training via field trips to foreign country have been carried out during the summer vacation. One of the trainings was a summer field trip to Mongolia carried out on Aug. 20 th to Aug. 30 th 2008. In this paper, I will provide the out line of the training and report on the educational result of the nine students who attended this training.

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Ground water pollution has been found widly in the Tomida district, found in previous studies. In order to identify the source of this pollution, we investigated the ground water in this area. High concentrations of phosphorus were found in 15 wells, and low concentrations of arsenic （lower than Japanese environmental quality standard） were also detected in 10 wells.

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The fifth Environmental School abroad was held with ECO ASIA University, Mongolia during 20-30 August 2008. Nine students and three faculties participated from Yokkaichi University. They studied Mongolian nature, especially forest degradation at the summit of mountains due to acid fog from coal combustion, and Mongolian peoples activities such as life of Ger and municipal waste and waste water treatment. The workshop was held where Japanese students introduced what they had studied at waste treatment and recycle factories by power points, while Mongolian students introduced how they think about environment protection and cleaning the city.

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