Bather, F. A. & Spencer, W. K. 1934. A New Ordovician Echinoid from Girvan Ayrshire. The Annals and Magazine of Natural History, Series 10 13, 557-558.
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Bather, F. A.; Spencer, W. K.
1934
A New Ordovician Echinoid from Girvan Ayrshire. The Annals and