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Gastropoda - Thersiteidae
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|Heilprin 1887||Shell irregularly oval, obconical, flattened, the flattened · appearance being due to three irregular swellings or knobs, one of which immediately adjoins the anteriorly directed fissure of the aperture; aperture narrow, projected forward (in its upper course) a.s a closely compressed fissure, which in a crescential curve ascends to within a comparatively short distance of the apex of the spire; outer lip? (broken in specimen); inner lip largely developed, completely concealing the whorls of the spire, and duplicating for a very considerable extent the outer lip; spire freely in- closed in a pointed superstructure, or dome, built over it by an extension of the mantle; surface covered with lon- gitudinal lines of growth, which extend continuously from the apex to the base.|