"Ten species (five new) and three subspecies (all new) of the family Hystrichosphaeridae, and a new monotypic genus, Mathurosphaera, of uncertain affinity are described from the Cambay basin of western India. The forms considered here are restricted to Oligocene and Eocene horizons only. Most of these organisms have been used successfully as index fossils to demarcate the pre-Miocene horizons."

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