ABSTRACT
In the process of compiling data for the CIESM Atlas, records for nearly 200 species were reviewed, of which only 136 exotics (plus Alvania dorbignyi, a cryptogenic species reported in 1982) were accepted and given a full coverage. A list of spurious records that continue to exist in twentieth century checklists or identification guides or published in the past three decades, is presented in Table 1. For those 62 species, a statement of the reasons for which the record is not accepted is given in the Atlas. Faulty records (see below) from earlier than 1900 were omitted.
