Hermaphroditism in Bhyscotus, a Terrestrial Isopod

ABSTRACT The Rhyscotinae are shown to be a non-parasitic hermaphrodite sub-family of terrestrial Isopods. They are protandrous, the ovaries and oviducts making their appearance as individuals approach the female phase. The male external genitalia, vesiculae seminales, vasa deferentia, and a vestige of testis are retained throughout life. The facts are discussed in connexion with other forms, and the possibility of a cyclical alternation of sexes considered.