Descriptions of new species and notes on taxonomy of New Zealand Mollusca, No.2

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Abstract
Four new species of Miocene and Pliocene Mollusca are described, in the genera Arca, Buccinulum, Nassicola and Colubraria. Arca cottoni Waghorn is recorded from several localities of Waipipian to Castlecliffian age and graphically differentiated from the new species. Ovicardium Marwick is ranked as a subgenus of Acrosterigma Dall and A.(O.) parki (Marwick) is synonymised with A.(O.) rossi, an excellent specimen of Eumarcia benhami Marwick is figured, Thracia magna Marshall and Murdoch and Calliostoma (Maurea) waiparaense Suter are recorded from the Nukumaru Brown Sand, “Modelia” nukumaruensis Laws is transferred to Calliostoma (Maurea), Cheilea cf. plumea Laws and Zemacies prendrevillei Marwick are recorded from Waipipian rocks, Kaiparathina Laws is transferred from the Janthinidae to the Trochidae, “Merica” haweraensis Laws is placed in Trigonaphera Iredale, and Aeneator contractus Laws is synonymised with Penion haweraensis Powell. A previously unrecognised shellbed member of the Waverley Formation (Wanganui coastal section, Pliocene) is named and its fauna briefly listed.

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