_ Shell ovate-oblong, thick, convex, anterior obliquely rounded; hinge margin slightly curved and thickened beneath the umbones; inside fulvous, with a reddish margin. [Please select]
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Surfaces smooth, with traces of very fine lines radiating from the umbones, sometimes rather plain on the basal part of the scuta. [Please select]
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These marks increase in size from the umbones to the margins of the valves. [Please select]
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Valves white, tinged with orange, smooth, moderately thin, occasionally with faint traces of striæ radiating from the umbones. [Please select]
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Valves rather thick, opaque, either pale or dark flesh-red, smooth, yet rather plainly striated from the umbones. [Please select]
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The pointed umbones are divergent, and internally under each, there is a large tooth. [Please select]
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_Valvæ 5, approximatæ: scutorum umbones in medio marginis occludentis positi: carina rectangulè flexa, sursùm inter terga extensa, termino basali simpliciter concavo. [Please select]
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In all four valves of Ibla, the umbones, or centres of growth, are at their upper points. [Please select]
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The umbones of the rostral latera must have been close together, over the unknown rostrum. [Please select]
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The latter, in well preserved old specimens, may often be detected on the umbones of the scuta, terga, and carina, but not on the umbones of any other valves. [Please select]
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_ Valves 5, approximate: carina extending up between the terga, terminating downwards in an embedded fork, or in an external disc: scuta sub-triangular, with their umbones at the rostral angle. [Please select]
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