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Show 887.] MOLLUSKS OF T H E VITI ISLANDS. 305 Genus MOUSSONIA, Semper. 1. MOUSSONIA FUSCULA, Mousson. Diplommatina (Moussonia) fuscula, Mousson, Journ. de Conch. 1870, p. 188, pl. 8. fig. 9 ; Pfeiffer, Mon. Pneum. iv. p. 93. Moussonia fuscula, Paetel, Cat. Conch, p. 102. The type was found by Dr. Graffe on Oneata, one of the Windward Islands. Prof. Mousson mentions a var. vitiana from Viti Levu. It is a minute, dextral, abbreviately turreted species of a brownish horn-colour, with fine striae and 7 rounded whorls, of which the penultimate is the larger. The body-whorl is rather slender, rounded, and ascending. The aperture is circular, and the columella bears an obtuse plait or tooth. Peristome expanded. Length 2 millim. Genus OSTODES, Gould. 1. O S T O D E S D I A T R E T U S (Gould). Cyclostoma diatretum, Gould, Proc. Bost. Soc. Nat. Hist. 1847, p. 205 ; Expl. Exp., Shells, p. 105, fig. 124. Cyclotus diatretus, Pfeiffer, Consp. Cyclos. no 22 ; Mon. Pneum. i. p. 33 ; Gray, Cat. Phan. p. 18. Cyclophorus (Ostodes) diatretus, var. intercostata, Mousson, Journ. de Conch. 1870, p. 179. Dr. Gould's type specimens of this rare species were found on the west end of Vanua Levu. I obtained two dead specimens at Vanua Balavo, one of the Windward Islands, where Dr. Graffe also found a single dead example, and one on Oneata, which Prof. Mousson characterized as var. intercostata. This species is readily distinguished by its depressed form, wide open umbilicus, rude spiral, unequal, elevated lines, whitish horn-colour, rounded aperture, and simple peristome. Diam. 12 millim. It is very closely related to the New-Caledonian O. bocageanus, but is smaller and more depressed. Whilst searching in the mountains on the west end of Vanua Levu I found a very much weathered Ostodes twice the size of Gould's species, and subsequently found a similar specimen on the beach at Kioa Island. The specimens are in the Museum Godeffroy in Hamburg. It is undoubtedly an undescribed species. 2. OSTODES LIBERATUS, Mousson. Ostodes liberatus, Mousson, MS., Mus. Godeffroy, 1885. Shell widely umbilicated, depressed, whitish horn-colour ; spire slightly elevated ; apex prominent; suture deeply impressed; whorls 4, convex, transversely rudely striated, undulated, and sculptured with numerous elevated spiral lines, larger, more prominent, and crenulated on and above the rounded periphery; umbilicus very'wide, showing all the volutions to the apex ; aperture circular, nearly vertical; peristome thin, continuous, straight. Major diam. 10, height 4 millim. Viti Levu. |