SOME SPECIES OF TETRAGRAPTUS FROM THE NINGKUO SHALE(LOWER ORDOVICIAN)OF ZHEJIANG(CHEKIANG)
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The present paper describes the following 19 species and varieties of Tetragraptusfrom the Ningkuo Shale of Zhejiang,among them 8 are new to science.1.Tetragraptus quadribrachiatus(Hall)
