Mr. Ed. Schoenmakers of Maastricht discovered the presence of Avenionia bourguignati (Locard) in a well near that town in the valley of the Jeker. Owing to technical difficulties it has not yet been possible to collect living specimens from that locality, but several specimens appeared tot contain the dried up animals, which proves that they lived in loco. The preservation of the specimens does not allow of an examination of the anatomy of this interesting species, but the situs and shape of the verge could be examined in a soaked male specimen. The kerge appears to bear a flagellum sheath on a common base (figs. a, b). Thsi common base bears a projection to the left which I cannot explain.