Report on the zoological collections made in the Indo-Pacific Ocean ...

•Hab.;112 COLLECTIOl^S FROM MELANESIA.a transparent white colour, and not pale olive-green like the restof the surface. At the anterior end a few oblique lines, commencingat the ridge which borders the luuide, fall across the concentricsculpture, but are only noticeable in certain lights. The dorsalmargin is very faintly arcuate in front and scarcely descending, atrifle more oblique behind, and rectilinear except near the extremity,where there is a very feeble sinuation. The lower outline is broadlyarcuate, considerably upcurvingin front, and at its junction with the- dorsal edge forms an obtuse or rounded angle ; at the posteriorend it ascends more gently (the curve being indistinctly interruptedby a very faint prominence which defines the portion of the surfaceupon which the concentric ridges are finer than elsewhere), producingwith the dorsal slope a sharpish rostrate end. The umbonesare rather large and prominent, coarsely concentrically sculptured,situated a little posterior to the centre, and incline somewhattowards the hinder side. The dorsal areas are distinctly defined byelevated margins, and the posterior is broader than the anterior orlunule. Teeth about 43 in number, whereof about 16 are onthe posterior side, and the vest in front. The interior of the valvesis transparent milky white, and the margin is acute and smooth.The pallial sinus is deep, narrow, and rounded at the end. Length17g millim., height Og, diameter 7.Port Darwin, 8-12 fms., mud and sand bottom.This species is very closely related to L. confusa, Hanley. It is,however, thinner, not so equilateral, more coarsely sculptured, hasmore prominent umbones, and the margin of the valves is notminutely crenulated within.62. Malleus legtiinen.Beeve, Conch. Icon. fig. 2.Rah. Philippine Islands (Cuming); Port Curtis {Coppinger).The interior of this species is waxy white, except the upper partof the nacreous portion beneath the ligament, where there is a largedark purplish spot. The non-nacreous portion exhibits a raised subcentralridge extending from the margin of the pearly lining nearlyto the lower extremity.63. Avicula lata.Gray, 1845, Ap^wndix to Eyre's Central Australia, p. 435, pi. 6. fig. 1lieeve, Conch. Icon. fig. 5.Avicula serrulata, Dunker, Zeitschr. f.Malak. 1848, p. 178 ; Conch.-Cah. ed. 2, p. 18, pi. 5. figs. 1, 2.Hah. West Island, Torres Straits, in 7 fms., sand {Coppinger);Port Essington (/. B. Jiikes in Brit. Mus.) ; Raino's Island, TorresStraits (Lieut. Ince, B.N., in Mus. Cuming) ; Moluccas (DunJctr).Eeeve and Dunker appear to have been unaware that this specieswas both figured and described by Gray. Apparently, as a rule, itis longer than cither of the specimens figured in the Conch. 'Icon.' or