Broad, D.S. Torpedaspis, a new Upper Silurian and Lower Devonian genus of Cyathaspididae (Ostracodermi) from Arctic Canada - Ottawa, Ontario Geological Survey of Canada 1973 - pp. 53-91 láms. Subjects--Topical Terms: DEVONICOOSTRACODAPALEONTOLOGÍASILURICO Subjects--Geographic Terms: CANADA