In this as in the previous part attention may again he drawn to the comparatively large number of European forms in South African waters, and to the very wide distribution of others which occur there. Thus the purple Polynoid, Polynoë (Macellicephala) mirabilis, ranges from the north-west of the North Island of New Zealand to the Cape on the one hand, and to the Kara Sea (Levinsen) on the other; whilst Polyeunoa Iaevis stretches from the Strait of Magellan to Prince Edward's Island and is now brought within 25 miles of the Cape. Indeed almost everyone of the species in this section is remarkable for its cosmopolitan tendencies, and, as critical examinations extend in future, it is probable that one or two still doubtful may be included in the same category. The range of such forms as Chaetopterus variopedatus, Cirratulus cirratus and tentaculatus, Dasybranchus caducus, Nicomache Iumbricalis, Potamilla reniformis, Bispira volutacornis and even the crustacean parasites of Annelids is remarkable, and show how much has yet to be done in the distribution of marine animals, and moreover illustrates the bold contrast they present to the distribution of land animals.
