Description: English: Adult male, Bonellia viridis, Rol. The original was 1.5 mm. long. The nervous system is not shown. (After Selenka.) a, Generative pore with spermatozoa coming out. b, Anterior blind end of intestine attached to the parenchymatous tissue by muscular strands. c, Green wandering cells containing chlorophyll. d, Parenchymatous connective tissue. e, Epidermis. i, Intestine. j, Vas deferens. l, Internal opening of vas deferens. m, The left anal vesicle. n, Spermatozoa in the body-cavity. Date: 1911. Source: Encyclopædia Britannica, 1911. Author: Encyclopædia Britannica, Volume 8, Slice 10., available freely at Project Gutenberg.
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.