The Echiuroid Gephyrea (see p. [434]) are by some authorities considered to be a division of the Chaetopoda.
Another worm, Histriobdella (Histriodrilus) homari, which is parasitic on the eggs of the lobster, and which occurs on our coast, has been placed amongst the Archiannelida. It is a minute form, with peculiarities in its anatomy which render its affinities uncertain.
Quart. J. Micr. Sci. xxvii. 1887, p. 109.
J. Mar. Biol. Assoc. vol. i. (n.s.) 1889-90, p. 119.
Schimkewitsch, Zeitschr. f. wiss. Zool. lix. 1895, p. 46.