The collection of shells made during the voyage of the " Chevert " is very large, and comprises many species hitherto unknown. The arrangement and descriptions of them, which, by Mr. Macleay's desire, I have undertaken, is not, therefore, a thing that can be done in a day, or in one paper ; I have accordingly limited myself in this, the first of a series of papers, to the descriptions of the new species of land shells in the collection. 1. -Helix (Rhytida) Beddomei. Shell largely and openly umbilicated, rather depressly globose, very thin, obliquely closely rugosely striated on upper surface, pale yellowish brown, shining, irregularly streaked with dark yellow ; apex obtuse, whorls 4|, moderately convex, the last very large, slightly flattened and inflated in front ; suture distinct, rounded at the periphery ; base convex, nearly smooth, umbilicus perspective, margin smooth, aperture oblique, lunately ovate, peristome simple, pinkish within, margins approximating, the right descending in front, collumellar margin broad and reflected. Diam. Maj. 14, min. 11J, alt. 7 lin. Hob. Albany Island and Cape York, North Australia. OF NEW SOUTH WALES. 99 This species is somewhat allied to Helix Franklandensis Forbes -it differs by being much thinner, more turbinated, coarser in sculpture, smaller umbilicus, pale yellowish, with darker radiating streaks. It was first found by Mr. C E. Beddome, on Albany Island, some distance below the surface, amongst great quantities of volcanic scoria, and when at Cape York last July, 1875, I also found it in the same localities 2. -Helix (Rhytida) Jamesi. Shell umbilicated, flatly orbicularly depressed, very closely and finely striated, glossy, bright horn yellow, streaked with brown rays ; whorls 4, slightly convex, quickly increasing, last very large and flattened in front ; not descending, striae showing more plainly at the suture, spire depressed, apex obtuse, roundly convex at the periphery, base rounded, nearly smooth, rayed as above, umbilicus wide and moderately deep, aperture diagonal, lunately oval, peristome thin, simple, margins distant, right straight, the outer arched, columellar slightly reflected. Diam. Maj. 10|, min. 8|, alt. 4 lin. PROCEEDINGS OF THE LINNEAN SOCIETY Diam. Maj. 4^, min. 3^, alt. 2, liu. Hab. Palm Island, North-east Coast of Australia. This species varies in colour from bright chestnut to yellowishbrown, and has dark irregular radiating rays. Ten specimens found. 4. -Helix (Thalassia) annulus. Shell minutely perforated, depressed, thin, transparent, smooth, shining olivaceous or yellowish horny, spire moderately conical, apex obtuse, whorls 5, slightly convex, pei'iphery I'ounded, above banded with one dark-brown band running into the suture and spirally to the apex ; base convex, smooth, umbilicus minute, shallow, aperture nearly diagonal, lunate, peristome simple, acute, margins distant, the right thin, the columellar margin whitish, thickened, slightly reflected. Diam. Maj. 6^, min. 5J, alt. 3, lin. Hab. Banks of Katow River, New Guinea. This thin transp...