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Volume 70, 1940-41
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The Lower Pliocene Beds at Hawera and at Kaawa Creek.

To the 73 species recorded by Powell (Rec. Auck. Inst. Mus., vol. 1, no. 2, pp. 87–89, 1931) from Waihi Beach, Hawera, the following 40 have now to be added:—

(K indicates that the species is peculiar to the Hawera and Kaawa Creek faunules).

  • Nucula nitidula A. Adams.

  • Nucula (Linucula) aptera n.sp.

  • Cuna morator n.sp.

  • Arthritica bifurca (Webster).

  • Melliteryx parva (Desh.).

  • Virmysella n.sp.

  • Maurea n.sp.

  • Antisolarium conominolium Laws. K.

  • Elachorbis cingulatus (Bartrum). K.

  • Elachorbis hawera n.sp.

  • Ataxocerithium simplex Marwick.

  • Zegalerus tenuis (Gray).

  • Tanea socia (Finlay).

  • Cerithioderma (Miplioderma) mangawera n.subg. n.sp.

  • ? Acirsa n.sp.

  • Chemnitzia ngatutura Laws. K.

  • Eulimella sp.

  • Odostomia bartrumi Laws. K.

  • Odostomia cf. turneri Laws.

  • Cylichnania cf. bartrumi Marwick.

  • Odostomia n.sp.

  • Waikura n.sp.

  • Evalea n.sp.

  • Pyrgulina rugata n.subsp. K.

  • Aeneator contractus n.sp.

  • Zelandiella pliocenica Powell.

  • Xymenella pusilla (Suter).

  • Inglisella hirta Laws. K.

  • Merica haweraensis n.sp.

  • Zafra impedita n.sp.

  • Alocospira subhebera (Marwick).

  • Austrotoma prolixa n.sp.

  • Austrodrillia koruahinensis Bartrum and Powell. K.

  • Bathytoma hawera n.sp.

  • Liracraea sata Laws. K.

  • Liracraea cf. sata Laws.

  • Zeacuminia planitas n.sp.

  • Rhizorus marwicki Bartrum and Powell. K.

  • Kaitoa cf. recta Marwick.

  • Cadulus cf. teliger Finlay.

It is interesting to note that 11 of the species listed above occur also at Kaawa Creek, 10 of them being found only in the Hawera and Kaawa Creek faunules. As a result of these additions the total number of species common to the two faunules now stands at 29, and there is little doubt that further search for small molluscs will show additional connection between them. The presence at Hawera of the hitherto exclusively Kaawa Creek species indicated in the above list strengthens the argument for correlation of these

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two horizons. The Pyramidellid unit in the beds at Hawera affords the same evidence, for it has much in common with that at Kaawa Creek, such species as Chemnitzia ngatutura, Odostomia bartrumi, and Waikura n.sp. in particular being distinctive.

The additions in the above list bring the total number of species at Hawera to 113, and reduce the percentage of Recent species from 35·62, as determined by Powell (Rec. Auck. Inst. Mus., vol. 1, no. 2, p. 89, 1931), to 23·0; compared with this the percentage of Recent species at Kaawa Creek is 21·6. Continued collecting at Hawera, however, no doubt will still further reduce this percentage.