IN 1944 Hartman¹ described a new polychsete species Longosoma catalinensis from off Long Point, Catalina Island, southern California, founding a new family, the Longosomidae, to contain it. The original description was based on a single specimen, but afterwards in 1957 she reported 34 specimens from three stations off southern California in depths of 7â 45 fathoms. According to Hartman² the species may have its affinities with the Paraonidae ; but the possession of long, paired, grooved palpi, resembling those of spioniform annelids, allies it to the disomid and magelonid families.