【摘 要】
：
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 o
【机 构】
：
The Geological Survey of China,
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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.
Recent study, has brought 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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