A series of specimens from the Scottish Limestone Coal Group (Lower Namurian) is described, among which occurs Adelophthalmus cf. wilsoni (Woodward) from West Lothian, a group of specimens from the No. 2 Ironstone of Loanhead, Midlothian, one of which is recognized as belonging to the new species Mycterops (?) blairi, and a prosomal appendage from Lanarkshire which is referred to the genus Hibbertopterus. New evidence is presented on the nature of the prosomal appendages of Eurypterus (?) stevensoni R. Etheridge jr. which is designated the type species of the new genus Dunsopterus. The Coal Measures species Glyptoscorpius minutisculptus Peach is recognized as an eurypterid for which the new genus Vernonopterus is created. The systematics of these and other late palaeozoic genera which have been included by Kjellesvig-Waering (1966) in the families Woodwardopteridae and Hibbertopteridae are discussed.