For anatomy see Meyer, Mt. Zool. Stat. Neapel, vii. 1887.
Andrews, Journ. Morph. v. 1891, p. 271.
A. G. Bourne, Quart. J. Micr. Sci. xxiii. 1883, p. 168.
Closely allied is Manayunkia Leidy, which occurs in fresh-water lakes of America. Another fresh-water genus is Coabangia Giard, which perhaps deserves the creation of a special family. The anus is ventral and anterior. The chaetae are peculiarly arranged, dorsal uncini being present only on four segments. The first body segment carries a ventral bundle of five great "palmate" chaetae.
For the anatomy see Meyer, Mt. Stat. Neapel, vii. 1887; see also above, p. 306.