Transactions and Proceedings of the New Zealand Institute, 1898. [electronic resource]

Volume 31, 1898

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A. Valves exposed.
B. Posterior valve not greatly reduced in size or altered in form.
C. Central areas unsculptured save for growth-lines.
D. Sutural pores or tufts distinctly developed.
E. Lateral areas with subobsolete radiating riblets	P. superba.
EE. Lateral areas with at least 2 distinct radiate ribs	P. subatrata.
DD. Sutural pores absent, girdle densely covered with bristles	P. suteri.
CC. Central areas sculptured, at least at the Sides.
D. Large. Sutural pores with bifurcating bristles; girdle broad, reddish	P. biramosa.
DD. Small. Sutural pores with more than 2 bristles; girdle narrow, white or white and black	P. cœlata.
BB. Posterior valve reduced to a narrow crescentic form, strongly arched upward	P. ovata.
AA. Valves partially immersed in the girdle, which encroaches at the sutures	P. obtecta.

P. biramosa, Quoy and Gaimard.

Man. N.Z. Moll., p. 116.

P. superba (Cpr.), Pilsbry.

Pilsbry, Man. Conch. (1), vol. xiv., p. 319, pl. lxviii., figs. 55–61.

P. cœlata, Reeve.

Man. N.Z. Moll., pp. 115, 116.

Ziczac, Hutton, and terminalis, E. A. Smith, are synonyms.

P. suteri, Pilsbry.

Nautilus, vol. viii. (1894), p. 8.

Ciliata, Hutton (not of Sowerby), is a synonym: Man. N.Z. Moll., p. 116.

P. subatrata, Pilsbry.

Proc. Mal. Soc. London, vol. ii., p. 190 (1897).

Atrata, Hutton (not of Sowerby), is a synonym: Man. N.Z. Moll., p. 114.

P. obtecta (Cpr.), Pilsbry.

Pilsbry, Man. Conch. (1), vol. xiv., p. 330.

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P. ovata, Hutton.

Man. N.Z. Moll., p. 117.