The genus Endopachys was founded by Lonsdale (1845) for some fossils from the Eocene of Alabama and according to MILNE EDWARDS and HAIME, these fossils belong to the same species as those previously described by Lea (1833) under the name Turbinolia Maclurii. Another species, Endopachys Grayi was described by the French authors from a specimen in the collection of the British Museum, and although there is, unfortunately, no record of the locality from which it was obtained it is regarded as recent.