From ZooTerms (Dictionary of Invertebrate Zoology)
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x-organ: 1. (Arthropoda: Crustacea) In Decapoda, a neuro-secretory organ situated in the eye stalk, and the cephalon of sessile-eyed crustaceans; frontal organs in Anostraca. See also organ of Bellonci, frontal eye complex, frontal organ.

2. (Kinorhyncha) In female chaetonotoids that lack an oviduct, a sac-like structure through which the eggs pass to the surface of the body.