_Lumbriconereis_ has a more or less conical prostomium, without any tentacles, but with large palps: segments without gills. _L. fragilis_ Müll. is reddish or brownish, with a beautiful iridescence; it is cylindrical, very narrow, and some 5 or 6 inches long; _L. tricolor_ Jnstn. is much larger. _Ophryotrocha_ (Fig. 170) is a small form often occurring in aquaria; it is chiefly remarkable for the possession of segmentally-arranged girdles of cilia—a permanent larval feature. _Lysidice ninetta_ Aud. and Edw. belongs here. FAM. 10. _Glyceridae._—Elongated worms with numerous segments. The prostomium, though narrow, is long, conical, annulated, and carries at its apex four very small tentacles; at its base a pair of palps. Special retractile gills are present. The armed pharynx is very long, and when protruded appears wider than the animal. The members of this family are without any system of blood-vessels, but the coelomic corpuscles are coloured red. _Glycera_ has four jaws, the parapodia are all alike (Fig. 136, C). _G. capitata_ Oerst. is 2 or 3 inches in length, is yellowish in colour, with a dark-red median line. It may be found burrowing in sand. The setigerous lobes of each foot are coalesced to form one large lobe with pointed apex. The dorsal cirrus is a small wart above the base of the foot. Atlantic and Mediterranean. A second species, which is much larger and flesh-coloured, also occurs. [Illustration: FIG. 171.—_Glycera meckelii_ Aud. and Edw. with pharynx everted, × 1. (_Règne Animal._)] _Goniada_ is distinguished from the preceding by the fact that the parapodia suddenly change in size and character at about one-third the length of the body. The pharynx has numerous paragnaths. _G. maculata_ Oerst. occurs off our coasts. FAM. 11. _Sphaerodoridae._—The dorsal and ventral cirri of each segment are spherical. The chaetae are usually jointed, and there is an aciculum to each {321}parapodium. _Ephesia_ Rthke. (_E. gracilis_ R. = _Sphaerodorum peripatus_ Jnstn.) is exceptional in having unjointed chaetae. North Sea, Arctic Ocean, and the Channel. The family, which is much modified, is allied in some respects to the Syllidae. FAM. 12. _Ariciidae._—These worms burrow in sand between tide-marks. The body consists of many short segments, and is nearly cylindrical. The prostomium is more or less pointed; the chaetae are all capillary; in the first few segments they project laterally but soon come to lie dorsally, and are carried by slight conical papillae (supported by acicula), which are longer in the middle of the body. Most of the segments carry filiform "gills," representing the dorsal cirri (Fig. 137, B).