Authors Year Title
Foord & Crick 1897 Catalogue of the fossil Cephalopoda in the British Museum (Natural History). Part III, containing the Bactritidae and part  of the Suborder Ammonoidea).
pp.I-XXXIII, 1-303, 145 figs., London.
Whidborne 1890 A monograph of the Devonian fauna of the south of England. Part II. The fauna of the limestones of Lummaton, Wolborough, Chircombe Bridge, and Chudleigh.
Palaeontological Society, 43: 47-154, pl.5-15; London.