The marine invertebrate macro-fossils of the principal marine bands of Namurian age in Central Scotland are described. The species identified are listed and the vertical and lateral distributions of some species within the region are discussed together with notes on the palæogeography and palœoecology. Notes on the morphology of certain species are given and Campylites carbonarius (McCoy), Dyscritella leei sp. nov., Koninckopecten gen. nov. (type species Limatulina scotica Hind), Myalina mitchelli sp. nov., Palœoneilo mansoni sp. nov., Paleyoldia macgregori sp. nov. and Schizodus portlocki (Brown) are described.