From Tonna cerevisina var. haurakiensis Hedley = (T. variegata of New Zealand authors), T. tetracotula differs by the presence in each main groove of an interstitial riblet, and also in absence of colour pattern, larger and thinner shell, in having a dark-brown protoconch, and the columella much, more twisted, with the bridging parietal callus concave leaving a very narrow crescentic umbilicus. T. cerevisina haurakiensis has a pink-coloured protoconch, and the parietal callus is convex leaving an open rounded umbilicus.

Cymatium waterhousei (A. Adams & Angas) Proc. Zool. Soc. (Lond.) 1865, p. 35.

The figured specimen (Fig. 2) measuring 52 mm. × 30 mm., was obtained alive at low water at Parengarenga, New Zealand, by Mr. W. La Roche. The type is from Port Lincoln, South Australia. The species has not previously been recorded from New Zealand, but is represented in the author's collection from Albany, Western Australia, and Sunday Island Kermadec Island, and has been recorded from Tasmania and quite recently from New South Wales in 30 fathoms (Iredale, 1925).

Cochlis migratoria n. sp. (Figs. 3, 4, 5, 6).

Natica gualteriana of Australian authors. Shell small, semiglobose, fairly solid, polished; spire low, about one-third height of aperture; funicle large leaving at junction with parietal wall a a narrow crescentic groove which terminates above in very small rounded umbilicus. Whorls five, smooth, polished, except on shoulder, which is sculptured on all adult whorls with close fine furrows, radiating from suture. Suture abutting. Protoconch minute, depressed, of one and a half whorls. Ground-colour greyish-white; protoconch reddish-brown; early post-nuclear whorls and broad sutural band, white; body-whorl with four narrow spiral bands of chestnut or purplish-brown; upper two sometimes fused into one broad band; funicle and parietal callus pale-rose, stained darker in places, mostly along edge of parietal callus and umbilical margin of funicle. Operculum typical of Cochlis with single marginal sulcus, rather thin and flat, exterior glistening white, interior with yellowish polished horny epidermis.

Holotype in author's collection, Auckland.

Parengarenga Harbour, New Zealand (collected alive, half con cealed in sandy mud at low tide by Mr. W. La Roche)^*, June 1925; Awanui Heads, New Zealand (Collected by W. La Roche) April 1925; Shellharbour, New South Wales (A. E. J. Thackway); Norfolk Island (C. L. Wragge).

Hedley (1913) ascribed the New South Wales shells previously recorded as Natica marochiensis, Lamk., to N. gaulteriana, Recluz, and the following notes were published by him after study of type material in the British Museum (Natural History).

“In the British Museum at least two species are exhibited as ‘maroccana chemnitz’ or ‘maroccana var.’ There is a tablet with five specimens labelled ‘maroccana Chemnitz, Cape York, N. Australia, J. B. Jukes, Natica marochiensis, Lamk. Voy. Ast., t. 66, f. 16.’ This has a low spire, radial furrows on the shoulder and the operculum of Cochlis, i.e., with a single marginal sulcus. Again there are three specimens from Senegal and three from River Gambia,…. which although called by the same name as the Cape York series, differ by having a higher spire, finer shoulder wrinkles and the operculum of Natica, i.e., spirally sulcate…. With the Cape York shells, there also agrees a set of three labelled ‘Gualteriana, Pet., from Isle of Bohol, M.C.’ Though these are not marked types, I have some confidence in regarding them as the originals of Reeves figure, and of the second description of Recluz, which differs in minor details from the first. Even the error of Cumings' clerk, in misquoting the editor for the author of the species supports their authenticity.”

“Granting this, ‘maroccana’ or ‘marochiensis’ may be reserved, as the name implies for an African species; while the Australian shells…. should be referred to gualteriana.”

The specimen figured (Fig. 7) measuring (Ht. 14.5 mm., Diam. 15 mm.) from Pearl City, near Honolulu, Hawaiian Island, is considered by the writer identical with the Philippine Island gualteriana. Gualteriana by Reeve's figure (1855) and specimen quoted above has the same type of radial furrows on shoulder as in migratoria n. sp. but differs in the colour bands being broken up into rectangular dots, the parietal callus not being coloured, and the funicle being much smaller, leaving a much larger umbilical area. The operculum, however, presents the most difference, being much thicker and heavier than that of migratoria, with exterior noticeably convex and not nearly so pointed above. In the three specimens examined from Hawaiian Islands these characteristics are quite constant, so the writer has no hesitation in separating the temperate shells from the tropical gualteriana.

The British Museum specimens from Cape York, examined by Hedley, are no doubt true gualteriana, but all the Australian temperate specimens the writer has seen are referrable to the n. sp. migratoria.

No doubt with careful collecting many regional forms of this series will be found in the South Pacific. Several specimens from Tahiti and others from Rarotonga in the writer's collection are both separable at sight from either gualteriana or migratoria, but are nearer to the first named species.

Dall (1892) explains that in most species of Natica and allied genera the shape of the shell varies slightly according to sex. Males