Pecten perfectus Melvill, 1909
MELVILL, J. C. 1909. Report on the Marine Mollusca obtained by Mr. J. Stanley Gardiner F.R.S., among the Islands of the Indian Ocean in 1905. Transactions of the Linnean Society of London, (2nd series), Zoology, 13: 65-138, pl. 5. [p. 127, pl. 5, fig. 15]
«408. Pecten perfectus, sp. nov. (Plate 5. fig. 15.)
P. testa compressa, aequivali, pulchre miniata, hic illic albo et nigro conspersa, radiis albis, praecipue marginem apud ventralem, obscuris decorata, auriculis valde inaequalibus, postica parva, obliquissima, antica decem-costata, breviter squamata, superficie omni in valva utraque, longitudinaliter arctissime et delicate tenuicostata; costis fere 55, minute squamulosis, fere regularibus; interstitiis planatis, nitidis.
Alt. 25, lat. 23, diam. 6 mm.
Loc. Chagos Archipelago: Peros Banhos, Diamant, 16 fathoms. This pretty Pecten seems most akin to the coarser P. irregularis, Sowb., which occurs in the same region and is widely distributed in the Indian Ocean. It differs in its far greater regularity of longitudinal costae, these being about 55 in number, close and fine-set, the interstices being smooth and shining; the ribs themselves are delicately scaly. The colour is scarlet-crimson, here and there flecked with white suffusion bordered by black spotting; around the ventral margin are five or six white rays, becoming soon evanescent. I am much indebted to Mr. G. B. Sowerby for his opinion concerning this interesting species.» JAMES COSMO MELVILL, 1909
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J. C. Melvill, 1909, plate 5.
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