Carbonate accretion in the larger foraminifera Nummulites Lamarck proceeds with the individual laminae being laid down on the sediment-free test surface at the time of chamber addition. In a marked departure from this general pattern, a few microspheric specimens of reticulate Nummulites collected from the Lower Oligocene rocks of southwestern Kutch, India were found to exhibit overgrowth of the test wall upon other benthonic foraminifera (OBF). It seems that wall overgrowth may have constrained the OBF specimens that plausibly thrived on the reticulate Nummulites.