Abstract: Gredler (1886) nominated a species of fresh water snail collected from Hunan Province, China, as Lithoglyphus modestus. Yen (1939) described four different species of Lithoglyphopsis, which had been collected from China and kept in the Natural Museum of Senkenberg, and one of them, L. modsstus, was dofined as the genotype of Lithoglyphpopsis, No further reports concerning the above-mentioned snail species were available since 1939.This paper reconfirms the existence of Lithoglyphopsis modestus in Hunan Province, as they have been found in Hengshan County of the province by the authors. The mo rphology of L. modestus was described in detail. The parasitologic relationship between L. modestus and Schistosoma japonicum was studied and the result showed that L. modestus can not serve as an intermediate host of S. japonicum in spite of the fact that miracidia did invade into the snail.