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Addendum
Since this paper was written further material has become available. Typical specimens of P. acuminata have been collected from the Lower Nukumaruan in the region around the Taueru River by Mr. D. Campbell, Honours student at Victoria University College. The sediments at this locality are chiefly sandstones and siltstones and are comparatively thin.
P. rugosa has been collected by Mr. R. L. Kite, of V.U.C., from the cliffs east of Lake Ferry at a horizon probably fairly low in the Nukumaruan.
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No mention has been made of P. fossa (Marw.). This species was recorded by L. C. King (1933, p. 339) from the junction of the Gladstone-Martinborough and Hinakura Roads, and P. cf. fossa from the junction of the Ruakokopatuna and Makara Streams. No specimens referrable to this species have since been collected from these localities and none of King's specimens are present in his collection at Victoria University College. It seems best, therefore, to delete P. fossa from the faunal lists of the two localities concerned.