N. gervaini sp. nov. is described and illustrated from several specimens collected during the cruise of the Polka , conducted off coast of Guadeloupe and Martinique between 148 and 500 m depth. The new species is compared with N. americana (Rathbun, 1898). The diagnostic features of Neopilumnoplax Serène in Guinot 1969, and Mathildella Guinot and Richer de Forges, 1981, are discussed.