Description: English: Female Bonellia viridis, Rol. Opened along the left side. a, Proboscis cut short. b, Bristle passing through the mouth into the pharynx. c, Coiled intestine. d, Anal tufts or vesicles. e, Ventral nerve cord. f, Ovary borne on ventral vessel running parallel with e. g, Position of anus. h, Position of external opening of nephridium. i, Nephridium—the line points towards, but does not reach, the internal opening.. Date: 1911. Source: Encyclopædia Britannica, 1911. Author:
Encyclopædia Britannica, Volume 8, Slice 10., available freely at
Project Gutenberg.
