Wall Structure of the agglutinated foraminifera Eggerella bradyi (Cushman) and Karreriella bradyi (Cushman)

Abstract. Specimens of the agglutinated foraminifera Eggerella bradyi (Cushman) and Karreriella bradyi (Cushman) have been sectioned to study their wall structure. Specimens of both species from the continental slopes off Britain have test walls composed of quartz, calcite and dolomite grains in an excess of calcareous cement. One specimen of E. bradyi examined came from below the C.C.D. and, in this case, the test wall is composed of quartz and feldspar grains with very little intergranular calcareous cement. This suggests one way in which a eurytopic, calcareous agglutinated species may adapt to living below the C.C.D.