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Excerpt from Thesaurus Conchyliorum, or Monographs of Genera of Shells, Vol. 5
Generic character - Tesla angulatim fusiformis vel tur binata, canali extus late umbilicato, varice spirali, exfoliata marginato. - The shells associated in our plate, and mostly supposed to belong to this genus, have one or more of certain characters which link them together so as to form in ap pearance a natural group. The type is Py'rula. Mawm, re markable for the breadth of its umbilicated disc in the region of the canal. This character appears more or less in all the species but two, which otherwise resemble the umbilicated species so closely as to be scarcely separable. The exceptions are L. Fruticosus, Gould, and L. Pagoda, Adams. The species are all peculiarly sloped down towards the angle excepting.
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