Recent study, has brought out the fact that members of the Spiriferidae, in which the sinus is plicated, are divisible into a series of distinct gronps, each of which shows a definite order of appearance of the plications in the sinus of the pedicle valve.
Abstract:
Recent study, has brought out the fact that members of the Spiriferidae, in which the sinus is plicated, are divisible into a series of distinct gronps, each of which shows a definite order of appearance of the plications in the sinus of the pedicle valve.
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A. W. GRABAU.1932. THE SIGNIFICANCE OF THE SINAL FORMULA IN DEVONIAN AND POST-DEVONIAN SPIRIFERS[J].地质学报,(1). A. W. GRABAU.1932.[J]. Acta Geologica Sinica,(1).
