Information concerning the soft anatomy of "Amphidromus" is widely scattered and fragmentary. The most complete account is that of Arnold Jacobi (1895) on specimens from Great Natuna (Natuna Islands) and Djemadja (Anamba Islands). Unfortunately, although it is clear that anatomical differences exist in the two species Jacobi dissected, unfortunately we do not know which forms he worked on, because he had incorrectly identified his material. In his paper he referred to the two species as "Amphidromus chloris" and the "interruptus" phase of "A. perversus". However, that is not possible, because in reality "Amphidromus chloris" is a species found only in the Philippine Islands, and the "interruptus" phase of "A. perversus" is not present in the Natuna Islands.