Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 901
Fig. 635.—Section of shell of Pinna, takentransversely to the direction of its prism. … STRUCTURE OF SHELLS accounted for by supposing that each is lengthened by successiveadditions at its base, the lines of junction of which correspond withthe transverse striation ; and this view corresponds well with thefact that the shell-membrane not unfrequently shows a tendency tosplit into thin…
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