Just to add a tidbit to it:
Leslie

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Powell, A. W. B. - 1976
Shells of New Zealand: An Illustrated Handbook. 5th revised edition.
Whitcoulls Publishers, Christchurch, New Zealand.
154 pp., 45 pls., 2256 spc.; ISBN: 0 7233 0470 X
[Formerly titled The Shellfish of New Zealand]
1937 - 1st Edition
1946 - 2nd Edition
1958 - 3rd & Enlarged Edition
1962 - 4th Edition
1967 - reprinted
1976 - 5th Revised Edition (as Shells of New Zealand)

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Powell, A. W. B. - 1979
New Zealand Mollusca: Marine, Land and Freshwater Shells.
William Collins Publishers, Ltd., Auckland, New Zealand.
xiv + 500 pp., 82 pls.; ISBN: 0 00 216906 1

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There is another author with a similar last name that did a NZ book too

Pownall, Glenn - 1971
New Zealand Shells and Shell Fish, Collecting : Eating,
Seven Seas Publishing Pty. Ltd., Wellington, New Zealand.
87 pp., 4 col pl, 35 pp. of col. ill., 15 b/w fig., ISBN: 85467 054 8
Reprinted 1974 & 1979 (my printing is the 3rd)

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