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Show 860 MR. G. F. ANGAS ON NEW BIVALVE SHELLS. [Nov. 5, Hab. China seas 1 (Belcher). Coll. Hanley. A n exquisitely sculptured species of great beauty, unique in the collection of M r . Hanley. SEMELE ASPASIA, n. sp. (Plate LIV. fig. 3.) Shell orbicularly ovate, nearly equilateral, subequivalve, moderately thin, yellowish white, concentrically very finely and regularly sculptured with close-set erect frilled laminae, the interstices being crossed by fine thread-like descending striae that correspond to the undulations of the transverse frills ; concentric ridges smooth and more distant at the umbones; interior of the valves very faintly tinged with flesh-colour. Long. 12|, alt. 10, lat. 6 lines. Hab. - - ? In coll. Hanley. This species differs from £. phryne in being thinner, more ovate, and less tumid in form, and in tbe transverse sculpture consisting of elegantly undulating frilled erect laminae, whilst the interstices between the descending striae are not squares but narrow parallelograms. SEMELE PHRYNE, n. sp. (Plate LIV. fig. 4.) Shell suborbicular, subequilateral, equivalve, somewhat tumid, solid, white, very finely regularly concentrically sculptured with close-set thread-like striae, the interstices of which are crossed throughout by similar thread-like descending striae, giving the surface of the valves a beautifully neat and regular reticulated appearance, excepting at the umbones, where the concentric ridges are more distant and the descending striae finer and nearly obsolete ; posterior side very slightly truncate and sinuate below, with a nearly obsolete flattened ridge extending upwards towards the umbo on the right valve ; interior slightly tinged with flesh-colour towards the base. Long. 15, alt. 14, lat. 8 lines. Hab. 1 In coll. Hanley. A solid, white, somewhat tumid species, very regularly and finely latticed throughout, the interstices taking the exact form of minute squares. LUCINA CITRINA, n. sp. (Plate LIV. fig. 5.) Shell quadrately orbicular, very inequilateral, equivalve, rather thin, primrose-yellow, paler towards the base, concentrically sculptured with very fine thread-like striae, that become more distant as they approach the base; lunule very small, depressed ; umbones tumid ; beaks small, incurved ; anterior side produced and somewhat flexuous above ; interior of valves crenate at the edge, pale yellow. Long. 4, alt. 3-$, lat. 2\ lines. Hab. ? Coll. Hanley. A small species, of a peculiar primrose-yellow colour. LUCINA ROSEA, n. sp. (Plate LIV. fig. 6.) Shell elongately orbicular, equivalve, inequilateral, a little tumid, |