Th. sorbillans Lampert. Philippine Islands.
Th. mellita Conn. West Atlantic (Beaufort).
Th. faex Selenka. North of the Faroe Islands.
Bonellia.—Proboscis very extensible and bifurcated at the end. The body and proboscis are coloured a bright green. Two ventral hook-like bristles, but no peri-anal ring. A single nephridium. The above applies to the female; the males are degenerate, and live in the nephridium or pharynx of the female.
Three (or four?) species of this genus are known.
B. viridis Rolando (Fig. 220). Mediterranean, Adriatic, North Sea (Bergen).
B. minor Marion. Mediterranean (Gulf of Marseilles, Naples).
B. suhmii Selenka. Off Nova Scotia. Male not known.
B. fuliginosa Rolando? (Fig. 220). Mediterranean (Naples).
Hamingia.—Proboscis not bifurcated, about as long as body. No ventral hook-like bristles. One or two nephridia, which open at the apex of one or two well-marked papillae. The above applies to the female; as in the genus Bonellia, the male is minute and parasitic. It has two well-marked hook-like bristles situated behind the genital pore.