Pachybathron Gaskoin, 1853, is a rare deeper water genus with a very limited distribution in the southern Caribbean. The genus was wrongly placed in the Cassidae for a long time, but shell characters indicate that the genus is more closely related to the Marginellidae, i.c. the genus Persicula. Pachybathron cypraeoides (C.B. Adams, 1845) syn. P. marginelloideum Gaskoin, 1853, was collected on the Netherlands Antilles. The colour pattern of this species is more complex than was known before.