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MESODESMA NOVÆ-ZELANDIÆ (Plate VIII.).—Fig. 25 (late Paphia novæ-zelandiæ) is the common oval Pipi, or Kokota, of the Maoris. This whitish shell, covered with a thin, horny epidermis, is sometimes 2½ inches long. It is found in both the North and South Islands on sandy banks in harbours and in tidal rivers.
ATACTODEA SUBTRIANGULATA (Plate VIII.).—Fig. 24 (late Paphia spissa) is a white shell, found in considerable quantities on sandy ocean beaches at half-tide mark. When the tide is flowing it is a very common sight to see great numbers of these bivalves washed up by the surf from their beds, and it is very interesting to watch the speed with which they can bury themselves again. They attain a length of about two inches, and are known to the Maoris as Tuatua or Kahitua.
CHIONE COSTATA (Plate VIII.).—Fig 26 (late Venus costata) is a strong, solid white shell, with thick radiating ribs. The only live ones I have found were either washed up on ocean beaches, or inside schnappers. This fish appears very fond of the Chione costata, and swallows it without attempting to crack the shell. It attains a length of about two inches, and the Maoris call it Kaikai karoro, which name is also given to the Struthiolaria papulosa (Plate IV.) and the Mactra æquilatera (Plate VIII.).
CHIONE STUTCHBURYI (Plate VIII.).—Fig. 27 (late Venus stutchburyii) is the common round cockle, found in both North and South Islands. Although when found on clean sandy banks it is usually reddish-brown on the outside and bluish-white inside, it varies in colour if the sand contains an appreciable quantity of mud. It is called Anga or Huai or Pipi by the Maoris, and attains a length of two inches.
CHIONE OBLONGA (Plate VIII.).—Fig. 28 (late Venus oblonga) is a brown or brownish-white shell, with a white interior, and is rather larger and more solid than the Stutchburyii, besides being more oval.
