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[Gr. dendron = a tree, and Lat. pupa.] Zool.: A genus of gasteropodous Mollusks proposed by Mr. Dawson for the reception of the single specimen, Pupa vetusta , discovered in the Coal measures of Nova Scotia, in the hollow trunk of an erect Sigil lari a. Nicholson thinks the shell is so remarkably like some living chrysalis-shells, that there is no sufficient reason for framing a new genus for its reception.