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Show 310 MR. A. GARRETT ON THE TERRESTRIAL [Mar. 1, two carinations are evanescent. It is probably a distinct species. The type is also distributed throughout the group, and occurs at Wallis Island. This species may be recognized by its conical form, pale horn-colour beneath a light brownish epidermis, 6 convex whorls, incised suture, and filocarinate periphery. The basal perforation is margined by a rather distant keel. Length 6 millim. 11. OMPHALOTROPIS LAYARDIANA, sp. nov. Realea (Omphalotropis) rosea, Mousson (not of Gould), Journ. de Conch. 1870, p. 192. Omphalotropis bythinaformis, " MSS.," Paetel, Cat. Conch. p. 124 (ex Schmeltz in Cat. Mus. Godeff. iv. p. 74). I obtained several specimens of this species at Vanua Balavo, one of the Windward Islands. It may be described as follows :- Shell umbilicated, rather solid, ovate-conic, smooth, scarcely shining, uniform corneous ; spire rather short, convexly-conical, apex obtuse ; suture slightly incised; whorls 6-7, convex, narrowly tabulated, last one rounded; umbilicus large ; basal keel large, and distant from the umbilical opening; aperture abbreviately ovate, angular posteriorly and rounded in front; peristome obtuse, margins nearly or quite continuous. Length 6, diam. 4 millim. It differs from O. rosea in its smaller size, more abbreviate form, more swollen whorls, large umbilicus, and remote keel. Genus LAGOCHEILUS, Blanford. 1. L A G O C H E I L U S HISPIDUS, Liardet. Lagocheilus hispidus, Liardet, Proc. Zool. Soc. 1876, p. 101, pl. 5. figs. 10, 10a. "Shell small, bulimoid, hispid, of a brown colour; whorls 5|, spirally costate: aperture circular. " Hab. Gomia, Fiji." (Liardet.) The existence of this East-Indian genus in the Viti group is remarkable. So far as known, it has not been detected in any other part of the Pacific. Genus HELICINA, Lamarck. 1. H E L I C I N A TECTIFORMIS, Mousson. Helicina tectiformis, Mousson, Journ. de Conch. 1870, p. 199, pl. 8. fig. 7; Paetel, Cat. Conch, p. 126; (Trochatella) Brazier, Proc. Zool. Soc. 1871, p. 322 ; Schmeltz, Cat. Mus. Godeff. v. p. 98 ; Pfeiffer, Mon. Pneum. iv. p. 250. Helicina mangoensis, Sowerby, Proc. Zool. Soc. 1870, p. 250. This fine species appears to be peculiar to the small island of Mango, where it is very abundant on coralline rocks. A depressedly-conical, acutely carinated species of a uniform white colour, with a sulphur-yellow spire ; frequently greyish, more or less |