The character of head and parapodium in each family will be gathered from the figures accompanying the general description in Chap. X., so that detailed description is unnecessary. In all cases the chaetae form valuable specific characters.
The examples of the various families are British, unless the opposite is expressly stated; but most of them are not confined to our shores, and the foreign localities are usually given. No attempt is made to enumerate all the British species.
The following books may be found useful for identifying the worms:—
Claparède, Recherches anat. sur les Annélides observées dans les Hebrides, 1861; Annélides Chétopodes du golfe de Naples, 1868, and Suppl., 1870.
Cunningham and Ramage, "Polychaeta Sedentaria of the Firth of Forth," Trans. Roy. Soc. Edinburgh, xxxiii. 1888, p. 635.
Ehlers, Die Borstenwürmer, 1868.
Johnston, "British Museum Catalogue of Non-Parasitical Worms," 1865.
M‘Intosh, "British Annelida," Trans. Zool. Soc. ix. 1877, p. 371; "Invert. Marine Fauna of St. Andrews; Annelida," Ann. Mag. Nat. Hist. (4) xiv. 1874, p. 144.
Malmgren, "Nordiska Hafs-Annulater," Öfversigt af K. Vet.-Akad. Förhandlingar, 1865, pp. 51, 181, 355; and "Annulata Polychaeta," ibid. 1867, p. 127.