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

;94 COLLECTIONS FUOJI MKLANESIA.has a remarkably deeply sunken lunule ; it is 34 millim. long,31 high, and '28 in diameter.5. Venus torresiana. (Plate VI. figs. M-M 2.)Shell suhovate, moderately thick, nearly equilateral, concentricallyfinely ridged and radiately sulcated, white, irregularly rayed,streaked, and spotted with lightish brown. Anterior and posteriorends subequal, obtusely rounded, the latter rather the narrowerventral margin broadly arcuate. Posterior dorsal slope straightish,rather more oblique than in front. Luuule narrowly cordate, generallyof a chocolate-brown colour, partly so or merely whitish.Umbones small, red at the tip. Concentric ridges somewhat flattened,crowded, and subnodulous anteriorly through being crossed bythe radiating stride, thin and lamellar behind. Striae less distincton the central portion of the valves than at the extremities, andfiner and closer together down the posterior side than elsewhere.Interior more or less pinkish, finely crenulated at the margin.Pallial sinus moderate, sharply rounded. Length 16 millim.,height 12^, diameter 8.Hub. West Island, Prince of Wales Channel, and Thursday Island,Torres Straits, 4 fms. {Go^ypinger).This species is somewhat like V. (Chione) mesodesma, Quoy andGaimard, but is distinguished by its greater length and diff'orence ofcolour in the interior. It is also not so high, the concentric ribletsare thin and lamellar posteriorly ; and the presence of radiatingstriae at once separates it from the Xew-Zealand form. There areseveral specimens from the above localities, all having a rosy tip tothe beaks, the lunules more or less dark-coloured, the ridges thinposteriorly, and the striae in the same region finer and more numerousthan elsewhere.6. Venus gladstonensis.Angus, Proc. Zool. Soc. 1872, p. 612, pi. 42. fig. 8.Hah. Port Curtis (Anr/as and Coppinger).This species is remarkable for the fineness of the concentriclamellae, which exhibit the radiating slender lirae on the outer sideas is the case with other species. The crenulation of the innermargin of the valves is also excessively fine, and the pallial sinus isof moderate size and not very aciite.7. Venus subnodulosa.Hanley, Cat. Bivalve Shells, p. 300, pi. 16. fig. 19 ;Reeve, Conch. Icon.fig. 102 ; Deshayes, Cat. Conch. Biv. p. 143, as Chione.Bah. Philippine Islands (Hanlei/) ; Moreton Bay {Strange in coll.Port Curtis (Cojijyinger).This s])ecics is remarkable for the stoutness of the concentricCuming);ribs, which are rendered more or less subnodosc by fine radiating