Mimachlamys scabricostata (G. B. Sowerby III, 1915)
SOWERBY III, G. B. 1915. Descriptions of new species of Mollusca from various localities. The Annals and Magazine of Natural History, 16: 164-170, pl. 10. [p. 168, pl. 10, fig. 14]
1915 Pecten (Chlamys) scabricostatus G. B. Sowerby III, 1915
G. B. Sowerby III, 1915, plate 10.
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«Testa aequivalvis, asquilateralis, tenuicula, suborbicularis compressiuscula, supra peracuta, infra rotundata; auriculis valde inaequalibus, sinistra lata, acutangulata leviter squamosa, dextra multo brevior, rectaugularis, valva sinistra leviter convexa, undique angustissime radiatim lirata, costis 18-20 rotundatis, crassiusculis, aliquis breviter erecte squamatis radiata.
Alt. 55, lat. 50, crass. 16 mm. Hab. Swan River, West Australia.
About fifty years ago a considerable number of shells of this species came to London, and were distributed under various names, such as senatorius (Gmel.), gloriosus (Reeve), prunum (Reeve), &c.; but I have always considered the identification, to say the least of it, quite unsatisfactory. The species differs from all the varieties of senatorius (including those bearing the two last-mentioned names) by its broader and less numerous ribs, some of them bearing a few erect prominent scales, a character which at once catches the eye, as they only appear generally on every fourth rib, the others being nearly smooth or having only very small inconspicuous foliation. The colours, as in P. senatorius, are vevy varied; the shell I have selected as type is light brown at the upper part, and the remainder pink, while some are plain yellow all over; others again are mottled with brown, yellow, and white. The dimensions given are about the average. The largest of the ten specimens before me measures 68 X 65 and the smaller 40x36 mm.; but I have seen one magnificent specimen of a beautiful clear yellow colour throughout and measuring 78 mm. This shell belonged to the collection of the late S. I. Da Costa.» GEORGE BRETTINGHAM SOWERBY III, 1915
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