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622 EDGAE A. SMITH.slender riblets arranged in groups of three to five. Named after Mr Forster Cooper who wasassociated with jNIr Stanley Gardiner in the exploration of these islands.298. Pecten maldivensis, n. sp. (PI. XXXVI. figs. 19, 20). II, IV, VI.Testa compressissima, albida, plus minus roseo radiata et maculata, et maculis albis opacisinterdum variegata, tenuissime radiatim striata, lineisque incrementi tenuibus sculpta ; valvae subaequales,dextra vix convexiore ; auriculae inaequales, posticis paulo majoribus, levibus, anticis cpstistenuissimis paucis radiantibus ornatis.Longit. 17 mm., alt. 19, diam. 3^.Very compressed and usually very finely radiately striated, but sometimes smoother, with lessdistinct striae. The colour is variable, some specimens are entirely white with only a few colourspotson the dorsal slopes. Others are dirty whitish, with about seven rather obscure reddish raysand one example has the right valve rayed with red and the left blotched with opaque white andred. All exhibit the red-spotting at the sides of the dorsal slopes.299. Janira gardineri, n. sp. (PI. XXXVI. figs. 21, 22). V, VII.Testa mediocriter compressa, suborbicularis, costis 19 planatis, quadratis, latioribus quam sulci,instructa, undique confertim tenuissime concentrice lamellata ,• valva sinistra plana, albida, rufolineata et punctata, dextra alba, umbones versus rufo tincta ; umbones laeves, acuti, contigui, baudradiatim striati, nitidi, albidi, lateribus convergentibus rectis ; auriculae inaequales, posticis paulomajoribus, costis paucis radiantibus tenuibus parum conspicuis instructae, transversim tenuissimelamellatae, et linea cardinis valvae dextra squamicristata ;pagina interna alba.Longit. 25 mm., alt. 23, diain. 6.A ver)' beautiful species well characterized by the flat^topped and square-cut costae which arerather broader than the intervening grooves. The concentric fine lamellae seem liable to disappearfrom the grooves in the flat valve, but they are very conspicuous on the costae and towards theumbo are thickened, so that they are more like granules than lamellae. The red markings occurboth on and between the ribs. In the convex valve the lamellae are as conspicuous in tlie sulcias upon the costae. The lamellae upon tlie auricles are much more delicate and closer than thoseupon the rest of the shell. This species probably attains larger dimensions tlian those given above.300. Pallium plica, Linn. [Pecten plica : Reeve, 37, VJII). II— VI.301. Amussium paucilirata, n. sp. (PI. XXXVI. figs. 23, 24). V.Testa parva, compressa, tenuis, pellucida, laevis, polita, aequivalvis, valva sinistra alba, dextrapellucida albo et rufo radiata et variegata, radio conspicuo albo supra latus anticum ornata; auriculaeinaequales, postica valvae sinistrae infra leviter sinuata, posteriori valvae dextrae majori ; umbonesacuti;pagina interna radiatim substriata, lira brevi unica utrinque insti'ucta.Longit. 7^ mm., alt. 7J,diam. 2.An interesting little species, having one valve pure white and the other mottled and rayedwitli white and red. The presence of only two internal lirae is also remarkable. In addition tothese a short lira runs from the ligament-pit along the base of each auricle. Although tliesurface of both valves looks smooth and glossy, under a lens fine striae of growth are visible.The umbones are acute, that in the coloured or right valve being a little more prominent thanthat of the left. The opaque white ray down the anterior side appears to be a specific feature,for it is present in all the specimens examined.302. Semipecten forbesianus, Adams and Reeve, 37, VJ.