Illustrations of the recent conchology of Great Britain and Ireland, with the description and localities of all the species, marine, land and fresh water

72 MOLLUSCA. [PECTINIDES, p. 20!); Pecten subrufus, Pennant, p, 100, pi. 60, f. 63; Ostrca subrufus and Ost,·ea operc1ila,·is, Donovan, pi. 12; Brown, Wernerian Mem,, II, p, 513 ; l\!aton and Rackett, p. 98, Shell slightly oblique, suborbicular, with about twenty rounded, divergent ribs; whole surface covered with strong, longitudinal, and fine transverse, undulating slrim; undcr valve somewhat more convex than the othcr; auriclcs ncarly cqual, with very narrow, divcrgent ribs, and fincly striatcd longitu- dinally; colour various, yellow, orange, brown, beautifully clouded all(l variegated with different shades; inside white, fre- quently tinged with pink or lilac, with the ribs and furrows strongly markccl; margins deeply scallopcd; base of the auriclcs terminating extcrnally in an elc,·atcd, tooth-likc pro- ccss; above which, on the largcr car, are a fcw fine, short dcnticlcs; hinge margin ncarly parallel, turncd inwards in thc upper valve, scrving as a fulcrum for the hingc line of the opposile valvc, which is se, much shorter than the upper valve; umbones sharp pointed. Diamcter about two inchcs anda half. 4. PECTE:-! IsLANDrcus, pi. XXIV, f. 3. Pecten lslmulic11.Y, First Ed., pi. 33, f. 3; Chemnilz, VII, p. 314, pi. 65, f. 615,616; Lamarck, VI, p. 174; Turton, Biv., p. 2lll; Ostrea cinnaba,·ina, Dillwyn, Cat., p. 256; Brown, Ency. Brit., p. 418. Shell oblong, narrow abovc, ancl widcly expandcd below; with about fifty narrow, slightly elevated ribs, with a groovc in the centre of each, the interveniug furrows provided with a nnrrow, single, less elevntcd rib ; lhe whole of the ri_bs covered with obtusc, imbricatecl scales; colour varying from ycllowish- orange to cinnabar-red, ami dark browu. Dead shells of this species are common in the Clydc ami Kyles of Bute, but we only once met with a pair of vah·es united. Large specimens, mensuring four inches and a quarler in lenglh, were obtained by Henry Gore Booth, Esq., in the north ell(I of the West Kyle. 5. PECTEN VARIUS, pi. XXIV, f. 4. Pecten vm·ius, Firsl Ed., pi. 33, f. 4 ; Linné, Syst., p, 11,16; Chemnitz, VII, pi. G6, f. 633, 63-1; Pennanl, IV, p. 101, pi, G1, f. 6•1; l\'Ionlagu, p, 1'16; Ost,·ca vcwia, Maton and Rackett, p. !)7; Donornn, pi. 1, f. I ; Brown, Wernerian Mem., II, p. 513; lb., Ency. Edin., p, 5-1, pi. 53, f. H. Shell elongntecl, with about twenty-eight sharp, narrow echi- nated rihs; uncler valvc more com·ex than the upper one ; auricles very unequal, diagonally ribbed, and longitudinally striated, the larger one in the superior vah·e is much wrinkled; whole surfoce coverecl with nearly equidistanl, rough, concave ~pines, which are, howerer, less nnmerous towards thc um- hones; sometimes the spines on the ribs are superceded by imbrications, ami only slightly echinated towards the sicles of the Yah'es ; beneath the longer car of thc upper Yah-e are a fcw teeth-like processes, at which part there is a hialus betwixt the vah·es; whole surfnce Yarionsly colonrecl, some- times clouclecl with dark purplish-brown, bnrnt umber-brown, yellow, or orange; inside colourecl like the exterior, but the tones more subdued. Length two incites ami a quarter; brcadth two inches, Somctimes shells of this spccies are quite plain, ,·arying in colour fro1n deep orange to dark purplish-brown, sométimes purc white. This specics is not uncommon on rnost of the coasts of Britain and Ireland. 6. PECTEN NIVIUS, pi. XXII, f . 16. Pectm nivi11s, First Ed., pi. 34, f. 16; llfacgillivray, Phi!. Journ., XIII, p. 166, pi. 3, f. 1; Fleming, p. 384. Shell oblong; ears uncqual; with forty-two rounded ribs, proviclcd wilh a fcw scaly spines; thc intermediate furrows crossecl with numerous, transverse slriro ; externa! surface of a uniform cream-whitc; inside snow-white. Discovcrcd on the shorcs of I·Iarris, one of thc 1-Iebrides, by Profcssor Macgillivray. 7. PECTEN NEDULOSUS, pi. XXII, f. 17. Pecten ncbulosus, Brown, Report Brit. Association for 1834; lb., Edin. Journ. Nat. Hist., I, p. 9, f. l. Shell nearly circular, thc umbones acule; with sevcn broad, flat, unequal, divergent ribs; auricles unequal; externa! surfacc of both valvcs covercd with very fine, parallel, longitudinal strim, and also with very minute, undulating, transverse strim, which are hardly discernible to the naked eyc, but fcel rough to the touch; both valves somcwhat innated towards their base, with a series of longitudinal, densely-sct ribs, ancl the basal rnargins fincly crenulatecl two-thirds of the b readth of thc shell; upper, or co1wex valve, of a uniform rich reddish-brown, irregularly clouded with whitc ; under valvc generally ash- coloured, allCI immaculatc; inside bluish-white, of a pearlaceous lustre, exhibiting iridescent rellcctions. Length one inch and seven-eighths; breadth the samc. First found at Largs, mouth of thc Clyde, by Mr. John Blythe, of Glasgow. It has since becn found in Loch Fine, by Mr. Drew, Writer, lnverary; and I obtained it from Miss 1-Ielen Carmichael, who found it on thc shores of the larger Combrie Island, Frith of Clyde. I also met with it, by dredg- ing, off Rothesay. 8. PECTEN ODSOLETUS, pi. XXIV, f. 6. Pecfon obsolet1,s, First Ed., pi. 33, f. 6; Pennanl, IV, p. 102, pi. 61, f. 66; llfontagu, p. 149; Donovan, pi. 1, f. 2; Fleminir, p, 385; Turton, Biv., p. 213; Forbes, p. 40; Ostrea obsol~t;, Malon ami Hackett, p. 100; Brown, \Vcrnerian Mem., II, p. 5M. Shell nearly orbicular, rather compressed; with unequal auricles, thc one large and striatecl, the other very small; whole surface covercd with numerous, fine, longitudinal s iri.:c, some of which are more promincnl than the others, allCI placed al irre- gular dislances; variously coloured, sometimes of a uniform rcddish-brown, or llesh-colour, at others cloudecl wi th dark purple, or brown; inside smooth, white, or pale lilac, sometimcs of a brownish cast. Not uncommon in the British ami Irish seas. !), PECTEN L,EVJS, pi. XXIV, f. Í, Pecten lmvis, First Ed., pi. 33, f. 7; Pcnnaul, IV, p. 102; Montagu, p. 150, pi. ,1, f. 4; Ost,·ect lmvis, J\faton ami Hackctt, p, 100, pi. 3, f. 5; Brown, Ency. )3rit., p. 418. Shell suborbicular, Yal\'Cs nearly ec¡ual, cornpressed, thin, suh- pellucicl; <¡uite smooth, wi th the exception of a fcw conccntric indications of lines of growth; auriclcs longitudinally striatccl, and decussnled with very fine slrim; cars 11nec¡11al; colour ,·arions, pink, reddish-ycllow, or pale orange; insiclc glo~sy, bluish-white. Length six-eighths of an inch; breaclth nol quite so much.