1931) has shown that throughout the world, except the Austral-New Zealand region, Aturia last appeared in the Middle Miocene, and some doubt may therefore arise as to whether the Tongaporutuan is really Upper Miocene. As noted later, the larger Foraminifera offer strong grounds for correlating the Hutchinsonian with the Lower Miocene, while there are indications that the Waitakian is Aquitanian. If, then, the Tongaporutuan were taken as Mid-Miocene, the Awamoan would have to be included with the Hutchinsonian in the Lower Miocene because of important lineage differences from the Tongaporutuan. On the other hand, because of its strong specific resemblances, the Urenuian must be included with the Tongaporutuan—if in the Middle Miocene, then the Upper Miocene receives the Opoitian. This seems to be rather crowding the Lower Miocene at the expense of the Upper, and a better balance is preserved by regarding—as the writers do here—the Tongaporutuan (and the Urenuian) as Upper Miocene, the Awamoan as Middle Miocene, and the Hutchinsonian as Lower Miocene. The greater probability then appears to be that Aturia lasted in New Zealand until Upper Miocene, a probability all the more strengthened by Chapman's record of the genus from the Australian Kalimnan (Lower Pliocene) (Proc. Roy. Soc. Vict., vol. 34, pt. 1, 1921). A range to the Upper Miocene in Java has just recently been recorded by J. W. Durham (1940, Journ. Pal., p. 160).