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Keywords from Image Description:
The Quarterly journal of the Geological Society of London . PE OP DUNCAN THE STETJCTITRE OP Echinides du Depart de la Sarthe par Cotteau et Triger plate xxxiv fig the propriety of calling the species iplopodia is doubtful for the pairs of pores resemble in their arrangement those of Pedina The genus CypTiosoma Agass is characterized