Abdomen with the sides of the upper surface carinated. [Please select]
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_--Thorax remarkably compressed and carinated; prosoma pretty well developed. [Please select]
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Spire with carinated plaits, the interstices with slender, crowded, transverse grooves. [Please select]
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The small and distinctly tubular orifice, and the smooth carinated edge of the globose capitulum, appear sufficiently to distinguish this species from _A. [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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