Representatives of the family Ceramonematidae (Cobb, 1933) were found untill now mainly in shallow sandy bottoms. The five species mentioned hereunder, from which four are new ones were recovered from mud in the « Golfe du Lion » (Mediterrranean) at a depth of 310-580 m. A male specimen of Ceramonema chitwoodi De Coninck, 1942 is described. Two new species are added to the genus Metadasynemella: M. falciphala and M. cassidiniensis. Pselionema deconincki sp.n. is the first species of this genus with vacuolisations in the cuticle. Pselionema minutum sp.n. is a very small species
