In this article the find of a problematic fossil in an erratic Ordovician silicified limestone boulder from the Wilsumer Bergen (county of Bentheim, F.R.G.) is reported. The 70 mm long, 15 mm wide fossil consists of a concave subcylindrical, straight mould, showing a pattern of papillas in longitudinal and transversal rows. Between them there are a number of regularly repeated annuli. A relationship with the Onychophora is suggested. The fossil, or a latex cast of it, is available for further investigation. After examination it will be part of the Senckenberg-Institut collection in Frankfurt a.M.