, A, the tectum, of which half is seen; B, the parietes; and C, the intra-parietes. [Please select]
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Slight ridges separate the roof from the parietes, and the parietes from the intra-parietes. [Please select]
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The external surface is rounded, except near the umbo, where the edge is carinated; growth almost equally upwards and downwards; the parietes and tectum are not separated by ridges. [Please select]
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