The handsome _Terebella nebulosa_ of our own coasts is coloured bright red, sprinkled with white spots. _Nicomache lumbricalis_ is pink, with red girdles. Eunicids are frequently red or brown, and the red gills along each side, together with a brilliant iridescence, render these worms very beautiful. Nereids present a great range of coloration, from light green to sundry tints of brown and red in various combinations. Amongst the Serpulids our common _S. vermicularis_ is a very showy little worm, with its orange body, its red gills splashed with orange, and its orange operculum streaked with red; and a Southern form, _Placostegus coeruleus_, occurring at the Cape of Good Hope, is provided with beautiful lavender-blue gills. Our own Sabellids present examples of beautiful markings on the gills, in different colours or in different shades of the same colour. Amongst Polynoids, _P. leucohyba_, from the Antilles, has blue elytra; _Hemilepidia erythrotaenia_, a long worm from the Cape of Good Hope, has the anterior end of its body covered with light blue elytra, whilst the uncovered part is orange, with a broad magenta-red band along the dorsal surface. The Phyllodocids are mostly very brightly coloured. The common _P. lamelligera_ of our coast has a bluish-green body, with olive-green parapodia; but _Lopadorhynchus erythrophyllum_, {293}from Jamaica, has a blue body with red parapodia; whilst _Notophyllum myriacyclum_ has a brown body with longitudinal dark-brown stripes and yellow parapodia. Both these worms live in coral reefs, where brilliancy of colour is one of the characteristic features of the fauna. Other worms are of various shades of green: the dark green _Arenicola_ with red gills; the bright green _Eulalia viridis_; the deep green _Amphinome smaragdina_, from Jamaica; _Gnathosyllis diplodonta_, with its green and yellow body, serve as examples. Patterns or "markings" may be exemplified by _Lepidasthenia elegans_ (Fig. 156), and _Myrianida fasciata_, which has a bright red band on each segment (Fig. 149, p. 280). From this brief list of examples it will be seen that beautiful, and even brilliant, coloration is not confined to any particular mode of life; many of the most typically tubicolous forms, like the Terebellids and Serpulids, are as brilliantly coloured as the most typically free-swimming genera, like the Phyllodocids. Carnivorous forms like Amphinomids and Syllids present as wide a range of tint as the limivorous forms like _Cirratulus_, _Sabella_, or Maldanids. Shore-lovers, and deep-sea dwellers, and surface-swimmers, all exhibit equally bright or equally sombre tints; it is therefore difficult and rash to dogmatise on the "use" of these colourings to these animals, or to point to this worm as being protectively, to the other as being warningly, coloured; for we are too ignorant as to the habits of the worms.