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II.—On the Gault Aporrhaïdæ
Published online by Cambridge University Press: 01 May 2009
Extract
Group 4.—Spire moderately long, generally without carinæ, always ribbed transversely. Wing expanded and quadrate, prolonged posteriorly into a sharp point.
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- Copyright © Cambridge University Press 1875
References
1 Geol. and Nat. Hist. Repertory, 1865.
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