LOWER CAMBRIAN UNIVALVED MOLLUSCS FROM KURUKTAG,XINJIANG

The Lower Cambrian univalved molluscs described in the present paper were collected in 1977—1978 by the geological parties from the base of the Xidashan Formation around Xidashan, Kuruktag, Xinjiang. The material is generally well-preserved and includes three species ascr bed to three genera, in which one genus and three species are new, namely, Helcionella xinjiangensis sp. nov., Eocyrtolites radiatus gen. et sp. nov., and Cyrtodiscus? kuruktagensis sp. nov..Among them, the genus Helcionella is a common from in the Cambrian in many parts of the world, and it also has been reported from the Cambrian formations of the North China Province and from the Huangshandong Member of the Lower Cambrian Tongying Formation of the Yangtze Provinnce in China.

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