Part 9: The taxonomic research on the polychaetes of the subtropical-antiboreal west coast of Australia continues, and the studies on the polychaetes of the more southern coast of the antiboreal region start with material collected in the area between Dunsborough and Denmark in November 9 to 19, 1975. 84 species were found; 62 of them were already known to science. 53 of these known species were already found by the author farther north at the coasts between Derby and Dunsborough (Parts 2, 4, 6, 8). Two genera, seven species and one subspecies are new and will be described. 14 species could not be determined without doubts because of incompletement or juvenility. One of the already known species is recorded from Australia the first time:
Stygocapitella subterranea, an interstitial species. Two species of the already known species are new to Western Australia:
Micronereis halei and
Scoloplos (Leodamas) dendrocirris.