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Show 306 MR. E. A. SMITH ON THE [Apr. 1, PINNA PERNULA, Chemnitz. Pinna pernula, Chemn., Reeve, Conch. Icon. pi. 12. figs. 22 a, b. Hab. St. Croix, West Indies (Chemnitz) ; Madeira (Brit. Mus.). AVICULA HIRUNDO (Linn.). Hab. On the sea-beach, St. Helena (Melliss). PECTEN CORALLINOIDES, d'Orbigny. Pecten corallinoides, d'Orb. in Webb & Berthelot's Hist. Nat. Canaries, Mollusques, p. 102, pi. 7b. figs. 20-22 ; Sowerby, Thes. Conch, vol. ii. p. 65, pi. 12. figs. 3, 4. Hab. Canary Islands, Cape Verde Islands. This striking species has not previously been recorded from so southern a locality. PECTEN ATLANTICUS. (Plate XXII. figs. 9-9 b.) Testa obliqua, inaquilateralis, cequivalvis, mediocriter albida velfiavescens•,supra costas rufo vel roseo tincta costis rolundatis circiter \6,sulcos immaculafosmodiceprofundos aequantibus, instructa, inter et supra costas liris tenuibus, squamosis, ornata ; auriculae parva, incequales, postica dextrce oblique declivis, liris tenuibus radiantibus 5-antica paulo major, radiatim lirata, minute squamosa, vix sinuata; auriculae valvce sinistra liris tenuibus, squamatis, ornatce; pagina interna fiavo-albida, plus minus rubicunda. Longit. 29 millim., diam. 15, alt. 29. This species is remarkable on account of its oblique form, which is produced by the posterior slope being longer than the anterior. The angle at the apex, formed by the dorsal slopes, is about equal to a right angle. The surface is rough to the touch through the beautiful wavy lines of growth which everywhere adorn the surface, and, upon the ridges, become minute scales. PECTEN (JANIRA) TURTONI. (Plate XXII. figs. 10, 10 a.) Testa rotundata; valva plana leviter concava, rufescens rosacea, maculis albis, lineisque gracilibus, zigzagformibus, purpureis, ornata, costis radiantibus, tenuibus, aurantio-circiter 17-19, instructa, lineis incrementi confertis, pulcherrime lamellata; valva convexa, mediocriter vel purpurea, apicem versus pallida vel albida, inter purpurea tincta, costis paulo latioribus et planioribus valva superiore ; auriculaparvae, plus minus purpureo pagina interna valva profunda alba, fusco-purpureo marginata, v. plana in medio aurantio vel roseo, et ad marginem purpureo tincta. Longit. et latit. 32-34 millim. The fine ribs, the comparatively small auricles, and the beautiful raised lamelliform lines of growth are the chief distinguishing |
