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Show 184 MR. A. GARRETT ON THE TERRESTRIAL [Feb. 15, rather thin, the sculpture the same as on P. rugosus, and the colour ruddy corneous or whitish, often with a reddish spire. Though very frequently wholly decorticated, the epidermis, when present, is very thin, light fulvous, and usually beautifully mottled with green, which is occasionally disposed in zigzag pattern. Tbe aperture and lips are more or less intense saffron-yellow, paler in the throat. The columellar fold is not so conspicuous, and is more vertical than in the preceding species. The peristome, though usually simple, is often slightly expanded, particularly so in the Rambi shells, some of which have the lip slightly reflected. 11. PLACOSTYLUS GNAUENSIS. Bulimus gnauensis, Garrett, Amer. Journ. Conch. 1872, p. 235, pl. 18. fig. 8 (in err. guanensis) ; Pfeiffer, Mon. Hel. viii. p. 36; (Placostylus) Crosse, Journ. de Conch. 1875, p. 18. Placostylus gnauensis, Schmeltz, Cat. Mus. Godeff. vi. p. 81. This graceful species is common and peculiar to Gnau Island, where it lives on trees and shrubs. It may be recognized by its rather thin texture, oblong-ovate or elongate-ovate form, whitish, yellowish, or reddish horn-colour, ornamented with longitudinal undulating olive-green stripes, which are frequently shaded off with white. The surface is rugose, with small transverse corrugations. The aperture is tawny yellow or reddish, rarely white, and the lips, which are but slightly expanded, are more intensely coloured than is the throat. Length 45 millim. 12. PLACOSTYLUS GRAEFFEI. Placostylus elobatus, Mousson (not of Gould), Journ. de Conch. 1870, p. 124. Placostylus moussonii, " Graffe," Schmeltz, Cat. Mus. Godeff. p. 93. Bulimus, sp., Garrett, Arner. Journ. Conch. 1872, p. 232. Bulimus moussonii, Crosse (not of Pfeiffer), Journ. de Conch. 1875, p. 11. Bulimus grdffei, Crosse, /. c. p. 13 ; Pfeiffer, Mon. Hel. viii. p. 30. This ground-species appears to be restricted to the central portion of Viti Levu, where it was discovered by Dr. Graffe. I am indebted to the latter gentleman for two examples of this species, which is about the same size and shape as P. elobatus, but is a smoother shell, and the colour of m y two specimens is olivaceous without any markings. The aperture is whitish, and the columellar fold is more horizontal than in the latter species. 13. PLACOSTYLUS VITIENSIS, sp. nov. Bulimus vitiensis, Garrett, M S . (coll. Garrett). Placostylus vitiensis, "Garr.," Schmeltz, Cat. Mus. Godeff. vi. p. 81. Shell umbilicated, oblong-ovate, rather solid, slightly shining ; rosy flesh-colour beneath a thin translucent epidermis, which is decorated with longitudinal olive-green zigzag stripes ; surface of |