Recent studies of certain Paleozoic radiolarian assemblages have made it necessary to reexamine material described by Ruedemann and Wilson, and Aberdeen. The former material may well represent Radiolaria, but the structures are not well enough defined to warrant the reconstructions and identifications which those authors made. Aberdeen's Radiolaria, on the other hand, are well preserved and must be taken into account for comparative studies. A coordinate system, using the England Finder, for locating the position of type specimens oil slides has been devised. Twenty-seven of Aberdeen's figured types were found and have been given grid coordinates. Each type is discussed and observations are added which amplify the original descriptions.

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