Fossil remains of the species Plagiaulax becklesii are known from the Lulworth Formation of Durlston Bay in Dorset, England. They include at least one partial lower jaw with teeth, though there may well be further specimens. Some material has been reported from Galve, Spain.
Another possible species, P. dawsoni, was provisionally named by Woodward in 1891. This came from the county of Sussex, which is further east along the English coast. It was subsequently damaged and there seems not to have been a scientific description. Its discoverer, Charles Dawson has been implicated in the Piltdown hoax and Pevensey tiles hoax.[1]
References
^D.P.S. Peacock, 1973, "Forged Brick-Stamps from Pevensey."
Kielan-Jaworowska Z. and Hurum J.H. (2001), "Phylogeny and Systematics of multituberculate mammals." Paleontology44, p. 389-429.