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Show 470 MR. HARPER PEASE ON POLYNESIAN LAND-SHELLS. [May 2, gitudinaliter tenuiter striatis, pallide fulva vel rufescenti-fusca, rare indistincte fasciata; spira conica, apice acuto, vix mucro-nato; anfr. 7, planiusculi, ultimus convexus, | longitudinis testce fere eequans, basi vix attenuatus; apertura vix obliqua, oblonga, angusta, ringens, basi anguste rotundata, postice acute angulata plicee parietales 2, superior compressa, perobliqua, cum labro callo juncta, altera bifida; plica columellaris compressa, transversa; labrum dextrum extus incrassatum, intus ad marginem valde callosum, fortiter bidentatum ; apertura pallida, albida. Dimens. 5 X 3 vel 4 x 2 mill. Hab. Insula Hawaii. This species is rare; it is distinctly roundly ribbed, and the teeth of the aperture are very strongly developed. It varies considerably, the grooves becoming narrower and the interspaces taking a flattened lirate shape. The grooves and striae of this and P. striata are furnished with remote hairy bristles, which fall off when they become dry, and are therefore seldom preserved on cabinet specimens. The largest specimens, lirate and of a reddish colour, are usually mistaken for P. striata, Phil. This species never attains to the size of P. striata, and is never black. The species inhabiting the Island of Bourbon and registered by M . Deshayes in his work on the Mollusca of that island as P. striata, Phil., with a doubt, agrees with the type of the above species. I find, on comparison, no characters to separate them. LAIMODONTA CONICA, Pse. Laimodonta conica, Pse. Proc. Zool. Soc. 1862, p. 242; Am. Journ. Concb. 1861, p. 101. pl. 12. f. 15. Laimodonta anaaensis, Mouss. Journ. de Conch. 1869, p. 63, pl. 5. f. 1. The above was originally described from specimens collected in Central Polynesia. It was afterwards discovered by Mr. Garrett at the Island of Annaa, where it attains to a larger size. It varies in colour ; but the other characters of the shell are identically the same in both localities. MELAMPUS MUCRONATUS, Gld. Melampusmucronatus, Gld. Proc. Bost. Soc. 1849; Rep. Am.Exp. Ex. 1852, p. 204, fig. 242. E/lobium oryza, H. & A. Ad. Proc. Zool. Soc. 1854, p. 8. Auricula oryza, Pfr. Mon. Auric. 1856, p. 141 ; Novit. Conch. vol. i. p. 28, pl. 7. f. 17-19. I have received from Annaa fifty or more specimens of M. oryza, H. & A. Ad., the only species of its type inhabiting that small atoll, and type specimens of M. mucronatus, Gld., from the collection of the American Exploring Expedition, found at Raraka, a short distance from Annaa. The two are synonymous, although the descriptions vary. The Raraka specimens have more colour, and are rather smaller. The |