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

64 MOLLUSCA. [GASTEROPODÁ 3, PATELLA FonBESll, Supplcmentary plate, f. I, 2. Patella Fo•rbcsii, Smith, Werncrian Mcm., VIII, P· 59, pi. 2, r. s, 3.• Shell thin, pcllucid, obol'atc, gibbous, orangc-coloured; with regular, longitudinal, tubcrculous striro; l'erlex inclined, inílect- ed. Length two-tenths of an inch; breadth one-eighth. "The regular, tuberculated, longituclinal strire, radiating from thc submarginal apex, al once distinguish this specics from any of its allies among the Dritish Patellro. In form it re~embles the Lottia pulcliella. The margin behind the apex is trun- catcd, nnd thc colour of the shell is orange-yellow. \,Vhen the animal shall have becn examined, it may provc to be a LotUa." Fo1·bes. Dredged in Rothesay Day, by James Smith, Esq., of Jordan I-lill, adhering to a case-bottlc in ten fathoms water. 4. PATELI,A PELI,UCIDA, pi. XX, f. 2, 3, 7, 8, ancl 1l. Patclla pcllucida, First Ed., pi. 37, f. 11 ; Linm\ Syst., p. 1260; Da Costa, p. 7, pi, 1, f. 5; Pennant, p. 150, pi. 90, f. 150, right hand fig., and f. 152, bottom fig.; Patelllt frevis, Lamarck, VI, pt. I , p. 33•1; Da Costa, p. 7, pi. I, f. 5; Mon- tagu, p. 474; Maton and Rnckett, p. 233; Drown, \Vernerian Mem., II, p. 538; lb., Ency. Drit., p. 465; Fleming, Dril. An., p. 287; lb., Edin. Ency., p. 65, pi. 204, f. 2, 3, young; Turton, Drit. Fau., p. 197; Forbcs, p. 36. Shell smooth, subpellucid, thin, yellowish-green; back con- l'CX, elcgantly roundcd; with an inclining vcrtex, which is placed ncarcr one encl; from the superior portion behind the verlcx emanalc a serÍ('S of beautiful azure-blue, translucen!, interrupt- ed rays, irregular in point of number, varying from three to sevcn, ancl terminating on the margin; sorne nearly obsoletc, concentric wrinkles traversc thc shell; aperture ol'a); margin plain, inclining slightly upwards at both ends; insidc glossy, of n bluish opalescent cast of colour, changing in huc according to thc play of light. Lcngth onc inch; breadth nearly thrcc- qunrtcrs; hcight. Íl\'c-eighths. Patella elongat" ancl Patcll<t pana, Flemiug, Edin. Ency., p. 65, pi. 20,1, f. 2, 3; (pi. XX, f. 2, 3, nncl 7) Patclla bima- culata, Montagu, P· •182, pi. 13, f. 6; Turton, Brit. Fau., p. 197; i\faton ami Hackett, p. 235. (pi. XX, f. 7.) The young shcll, pi. XX, f. 2, 3, 7, S, is extrcmcly thin ancl brittlc, and of a much palcr colour than thc adult, usually of a yclluwish horn-colo11r. This spccics inhabits most of the coasts of Great Britain and Ireland, gcnerally ,ulhcring lo thc Fucus digitatus, afgm, ancl other marine plants. ~Iuch difference of opinion exisls rcspccting this ami the fol- lowrng shcll bcing of onc spccics. As far as my obscn·ation has gone, I an_1 inclincd to considcr them as different ; becausc I ha_,·c m:t. w1t!1 shclls of ali ages, agreeing with cach in its spcc1fic d1st111cllons. Thc vounrr of the foil · · · . . . • o owmg spec1cs 1s mvanably th1cker, and alwnvs dcprcsscd )'k ti <l 1 .1 ~ J t e 1c a u t; anc , moreo,·er, the P. pcll11cidn is alway· fo 11111 t O ti J f ¡ . ' ' :; n 1c caves o t 1c plants, wlnlc thc P. c,c,.ulc<t inhabits the ~tems or roots. My fricnd Williarn Nicol, Esq of Eiriiib · 1 1 . ·• urg 1, tas n most pcrfcct senes of both s!1clls, from the vcry youngest condition to thc most ma_iurc, wh1ch bcautifully illustratcs thc sub·cct. At thc mcet111g of thc British Association hcld t M~ 1 ter, in 18·12, Mr. Peach, of thc Prc1·enr1,·e 's . a 1 ,Gnnlc ics- 1-1 . erv1cc at 1oran a, en, Cornwall, read n Papcr and cxh'b•t 1 . . ' · 1 1 e< spcc1mens to provc their idcntity, but I <lid nol think he establishcd his views on the subject. 5. PATELLA C,ERULEA, pi. XX, f. 13. P11tella ca:rulca, First Ed., pi. 37, f. 13; Fleming, Edin. Ency., VII, p, 65, pi. 204, f. 1, adult, 1 a, young shcll; Pen- nant, pi. 90, f. 150, left hand fig., young; Brown, Wcrncrian Mem., p. 533; lb., Ency. Drit., p. 465; Forbcs, p. 3G; Mon- tagu, Sup., p. 152; Patella pclfocid<t, Montagu, Sup., p. 475; Donovan, I, pi. 3, f. 1 ; Maton and Rackett, p. 234, the adult shell; Da Costa, pi. 1, f. G. Shell depresscd, rathcr opaque, thick, slightly ovoid, of a yellowish-brown colour; vertex flat., much rounded, and siluatc ncar lo one cnd; conccntrically wrinkled, with a series of pale azure-blue, shining, interrupted radii, which cxtcnd from the , •c1·tcx lo the base, and generally,. also, 011 the sides; aperl urc subovalc, opalcscent, shining, blue internally; lips rather thick- encd. Length one inch; breadth eight-tenths; height. lh·c- tcnths. lnhabits most of the Dritish and Irish coasts, allachcd to the stcms and i11tcrstices of the roots of algm, F11cus digitat1tS, &c. GENus 17~LoTTIA~Gray. Shell patclliform, rather dcpresscd; vcrtcx obtusc, for thc most part placed considcrably towards onc end, pointing to thc posterior margin; muscular impressions not symmetrical, but widcst 011 thc right side, towards that porlion of thc shell wherc the head of the animal is situate; apcrlure gcncrally rathcr cir- cular; the central disc usually of a dccp brown, variable in intcnsity; with a flattish interna) margin. The shclls of this genus so closcly rcsemblc thosc of Patclla, that they are with difüculty distinguished. Thcy are, howcl'cr, gencrally flattcr. Thc animal is vcry distinct from that of I'a- tclla. J. LOTTIA TESTUDINALIS, pi. XX, f. 9, 10. Patclla clypeus, First Ed., pi. 3i, f. 9, 10; Patella testudi- nalis, Müllcr; Fab~icius, Fau. Grrenland, p. 385; Forbcs, p. 34; Patcll<tClcl<tnd1, Sowerby; Smith, Werncrian l\:Icm., VIII, p. 43. . Shell oval, subdcpressed; with numerous, fine, divergen!, sl'.ghtly waved, and rather regular striro, emanating from the shghtly acute, rcflected vcrtcx, and tcrmina{incr on the mar- . 1 o g111s; 1 1esc are crosscd by cxtremcly nnmerous, ami vcrv ~lose, concentric strim, ami somewhat distant, more conspicuou·s hncs of growth; cxtcrnal surface of a pale fawn colour, beau- tifully mottled with dark, reddish-brown, surrounding oblong- ovatc, rather regular eye-like spots of the ground colour; insidc l'cry g lossy, bluish-whitc; margin a little flat tened, ami orna- mc'.1ted with ncarly equidistant, dark brown spots; centre with an mtcnsely dark, reddish-brown, well dcfined, Jarcre mark sur- rounded by an indistinct disk of pale brown . 0 ' First. cliscovere<I as Ilritish by Stewart Ker, Esq., in the Garc Loch, on tlie Clydc, ami has since becn mct with in diffcrcnl parts of Argylcshire; and Profcssor forbcs fonnd it al I3al- laugh, Islc of Man, unclcr the surface of sloncs al vcry low water. 2. LOTTI,\ PULCIIEl,LA. Lottia ¡mlchclla, Forbcs, p. 35; lb., l\Iag. Nat. Hist., VIII, p. 591, f. 61.