This first one is from Coal Brook Dale, England and is called Prestwichia anthrax. The species was apparently discovered by Professor Joseph Prestwich in 1834-1836 (as Limulus anthrax). For any science fiction fans out there, it reminds me of a shadow ship on the TV series Babylon 5.
This next fossil is also from England and is named Prestwichia sp.
This last fossil is from Coal Brook Dale, England and is called Belinurus belulus. It is described in the Transactions of the Manchester Geological and Mining Society (May 1905) along with the previously shown Prestwichia anthrax on pages 124-127. The article is entitled "Prestwichia anthrax and Belinurus belulus from Sparth Bottoms, Rochdale" by Walter Baldwin. A scanned version of the article can be found at Google Books on the Internet.