| These are broad concavities in the ambitus that could be considered precursors to the ambulacral notches of certain mellitids. |
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| For each individual, 2 diameters were recorded across the ambitus and averaged. |
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| Test diameter was measured at 2 perpendicular points across the ambitus using calipers, and individuals were weighed to the nearest milligram. |
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| Notches are ambulacral lunules that form close enough to the ambitus that the ambitus is unable to close over the distal part of the notch to form a closed lunule. |
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| A tone cluster of very small ambitus gradually fans out, while its intensity grows. |
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| The ambitus designates the totality of notes which a singer can reach, from the highest to the lowest. |
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| A bit of expressive melody appears, imitating the modulations of a voice which stretches in a rather large ambitus. |
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| But what a spoken voice, even grandiloquent, would express within a fairly narrow ambitus is here enormously enlarged and makes use of the whole register of the instrument. |
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| At ordinal levels, in cassiduloids and holectypoids, ambitus is circular, elliptical or oval, while clypeasteroids have a pentagonal to circular type. |
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