Late Permian and Early Triassic gastropods of western Guizhou. Qianxi diandong wan erdieshi hanmei diceng he gushengwuqun. [Stratigraphy and palaeontology of Upper Permian coal-bearing formation in western Guizhou and eastern Yunnan, China., Science Press, Peking, 1980: 123-194. Chapter pagination: 195-240. 209 [Zoological Record Volume 117]