lirated and transversely ribbed. Hinder parts of the whorls not concave; twenty transverse ribs on the penultimate whorl, and about the same number on the body-whorl, but difficult to count because partly obsolete, especially anteriorly; spiral liræ about seven on the spire whorls, subequal, body-whorl with fifteen or sixteen. Canal moderate; aperture elongately oval, posterior sinus very slight.

Length .53; diameter .2; length of aperture .17 inch.

This species is distinguished from P. buchanani by the whorls being less carinated, not concave posteriorly, and the suture not margined; the recent specimens are not much more than half the size of the fossils from Awamoa.

Adeorbis (?) petterdi, Brazier (Fossarina). Jour de Conch., 1864.

I have received a specimen from Mr. T. F. Cheeseman, who informs me that he found four individuals at Waiwera, and that Mr. C. Mathews had also collected it at Omaha and Matakana. It is common in Tasmania.

Shell depressed, of three or four rapidly-increasing whorls, rimate, smooth, very faintly spirally striated; white, with zig-zag brown markings; aperture broader than long; yellowish, and not pearly inside. Operculum multispiral. Dentition rhipidoglossal.

I have examined an animal sent me from Tasmania by Mr. Petterd, and find that it belongs to the Trochinœ.

Acmæa, flammea, Quoy and Gaimard. Voy. Astrolabe, Zool. iii., p. 354, pl. 71, f. 15–24 (Patelloida). Tenison-Woods, Pro. Roy. Soc. Tasmania, 1876, p. 51.

Shell small, oval, depressedly conical, finely radiately striated; apex about one-fourth the length of the shell from the anterior end, pointed and hooked: shell thin, semitransparent, pale yellowish-brown, ornamented with irregular, usually more or less radiating, lines of brown; interior silvery.

Length .25 to .3; breadth .2 to .23; height .08 to .1 inch.

Animal white, the margin of the mantle fringed.

This species is common on rocks and on other shells throughout New Zealand. It is also found in Tasmania, Australia, and the Island of Guam. Mr. Tenison-Woods describes the shell as “somewhat solid,” but with us it is always very delicate and thin.

Acmæa conoidea, Quoy and Gaimard. Voy. Astrolabe, Zool. iii., p. 355, pl. 71, f. 5–7 (Patelloida).

Shell small, broadly oval, high, conical, smooth; apex rather anterior, blunt, usually rounded. Colour usually brown, but sometimes nearly white with brown radiating streaks; interior above the muscular impression dark or pale brown or blotched, margin dark brown, sometimes rayed with pale brown.