Concretions of the Wenlock Series Herefordshire Konservat-Lagerstätte of the Welsh Borderland have yielded one of the few recorded Silurian radiolarian faunas world-wide and the only one known from the Silurian of Britain. The low diversity radiolarian fauna consists of new forms of Inaniguttidae (<i>Inanihella sagena</i> sp. nov. and <i>Inanihella</i> sp.), Haplentactiniidae (<i>Haplentactinia armista</i> sp. nov.) and a previously reported form of Secuicollactidae (<i>Secuicollacta hexatinia</i> (Won <i>et al</i>., 2002)). The fauna has affinities with Silurian radiolarian assemblages of the Urals, the Canadian Arctic and Alaska. Stratigraphically the Herefordshire fauna appears transitional between established Silurian radiolarian biozones.