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After an extensive search for the type specimens of    Caecum   floridanum    Stimpson, 1851, we believe that these specimens may have been either lost or destroyed in the Chicago fire (1871). This paper presents a redescription of the species and a neotype is designated based on material from the type locality (Florida). Protoconch and growth stages of    C.   floridanum    are described and illustrated herein. The teleoconch IV of    C.   floridanum    is characterized by strong, wide, low, rounded, closely arranged axial ribs, except last three to four preceding the aperture, which are larger and more widely separated.    Caecum   compactum    Dall, 1892 is here synonymized under    C.   floridanum   .    Caecum   annulatum    Emmons, 1858 and    C.   dux    Folin, 1871 are not considered synonyms of    C.   floridanum    in this report.

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Redescription and designation of a neotype for    Caecum   floridanum    (  Littorinimorpha  ,   Truncatelloidea  ,   Caecidae  ) with a characterization of the protoconch and growth stages