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Show 338 LIEUT.-COL. H . H. G O D W I N - A U S T E N O N [June 18, LAGOCHEILUS, Blanf. Although the notch at the sutural margin of the peristome is very small and less apparent than in the typical Indian species, yet it is there, and in all characters agrees with the genus Lagocheilus as described by W . T. Blanford. 11. LAGOCHEILUS DIDO, n. sp. (Plate XXXIX. fig. 5.) Shell turbinate, rather thin, umbilicated narrowly; sculpture covered with a stony epidermis, smooth, with a distinct rib on the periphery, extending on to the penultimate whorl; colour amber-brown ; spire high, sides flat; apex pointed; suture impressed; whorls 6, moderately convex, the last subangulate, and angulate below round the umbilicus; aperture circular, subvertical; peristome double, with a slight sutural notch, the outer lip slightly expanded and reflected at right angles. Size: maj. diam. 10*0; alt. axis 7*0; diam. apert. 5*5 millim. Operculum not preserved in the only two specimens before me. Hab. Niah Hills (A. Everett). I have named this shell after H.M.S. 'Dido,' the officers and crew of which, on the first occupation of Sarawak by Rajah Brooke, did good service in the suppression of the pirates who then infested those waters. 12. LAGOCHEILUS KEPPELI, n. sp. (Plate XXXIX. fig. 4.) Shell globosely turbinate, rather solid, translucent, closely umbilicated ; sculpture a thick epidermis set with very fine short hairs, 5 or 6 delicate longitudinal lirate ribs, crossed by regular diagonal raised striae; colour dull ochraceous ochre, apex dark; spire high, sides flat; apex fine; suture moderately impressed; whorls 5|, rounded ; aperture circular, nearly vertical; peristome double, inner continues simple, with a very minute notch showing within the aperture; columellar margin rounded, the outer lip slightly reflected. Size: maj. diam. 8*25, min. 6*75; alt. axis 6*0 millim. Operculum thin, flat, transparent, spiral of about 8 turns. Hab. Niah Hills (A. Everett). This shell is named after Captain the Honourable Henry Keppel, of the 'Dido,' whose name occurs often in the early history of Sarawak and that part of Borneo. 13. LAGOCHEILUS MUNDYANUS, n. sp. (Plate XXXIX. figs. 6, 6 a, 6 b.) Shell dextral, moderately solid, conical, closely umbilicated; sculpture very minute transverse strise, with at distant intervals a fine costulate rib, very conspicuous in the very young shells, becoming obliterated with age; four fine spiral lirae ornament the last whorl, with one below the periphery, very minute short hairs are given off from the points of intersection of the lirate bands and the transverse rib, but these are lost as the shell grows older; colour pale olivaceous, crossed by transverse bands of dark liver- |