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地质学报 1932

THESIGNIFICANCEOFTHESINALFORMULAINDEVONIANANDPOST-DEVONIANSPIRIFERS

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Abstract:

Recentstudy,hasbroughtoutthefactthatmembersoftheSpiriferidae,inwhichthesinusisplicated,aredivisibleintoaseriesofdistinctgronps,eachofwhichshowsadefiniteorderofappearanceoftheplicationsinthesinusofthepediclevalve.

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