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The Tertiary Gastropoda from the lacustrine beds of Yungningformation had been studied by Odhner in 1930,and more recently byS.C.Hsu.The considerable number of new species found.by successiveinvestigators show that the Yungning formation is rich in molluscan
The Tertiary Gastropoda from the lacustrine beds of Yungningformation had been studied by Odhner in 1930, and more recently byS.C.Hsu.The quantities number of new species found. By successive investigations who show that the Yungning formation is rich in molluscan