Hincks, Brit. Mar. Polyzoa, i. p. 558.
See Hincks, Brit. Mar. Polyzoa, i. p. lxiv.; and Busk, Cat. of Marine Polyzoa in the British Museum, part ii. 1854, p. 103.
J. Linn. Soc. xv. 1881, p. 359.
"Challenger" Report, part xxx. 1884, pl. ix.
Hincks, Brit. Mar. Polyzoa, i. p. 58.