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

70 MOLLUSCA. [OsTRACEA. 1\-faton ancl Ilackett, p. 102; Lamarck, VI, pt. 1st, p. 228 ; Fleming, p. 395; Brown, Ency. Brit., p. 422; lb., Werncrian Mcm., p. 514; Turton, Biv., p. 229, pi. 18, f . 5, 6, 7; Forbcs, p. 38. Shcll suborbicular, smooth, thin, mcmbranaceous, and trans- parenl, gcnerally much compressc<l; com·cx valve a little thíckencd; llat val ve vcry thin, with a large pcrforation, for thc size of the shcll; outsi<lc <lull ycllowish-whitc, with vcry in<lis- tincl, concentric wrinklcs, or lincs of growth, which can only be secn by thc aid of a strong lcns ; inside white, with palc iridcsccnt rcílcctions; plug tcnclinous, very sclclom har<l at thc base, with thc lcrmination testaceous; umboncs small, llat, ami poiutccl. Common on ali thc British ancl Irish coasts, a<lhcring to shclls, stones, ancl F11ci. 4. ANOMIA ACULEATA, pl. XXII, f. 6. Anomitt aculcata, First Ecl., pi. 34, f. 6; Gmclin, Syst., p. :l346; Miillcr, Zoo!. Dan. Procl., p. 3005; Montagu, p. 157, pi. 4, f. 5; Flcming, Ediu. Ency., p. 98; lb., Brit. An., p. 3!)6; Brown, Ency. Brit., p. 422; Ib., Wcrncrian l\fom., p. 514; Maton ami Ilackctt, p. 103; Turton, 13iv., p. 233. Shcll thin, comprcssecl, orbicular, or slightly oblong; with numcrous raisccl, clivergcnt, intcrruptccl stri,c, which are sur- mounted with many small concave, obtuse murications, or spincs; umboncs small, turning a little downwards; uppcr valvc convex; uncler valve <¡uitc ílat ami smooth, but sometimcs pro- vi<lcd with small muricatious towarcls thc margin; perforation of meclium size, ami situatc ncar thc hinge; gcnerally of a palc dull brown, or crcam-white; insidc whitc, ancl slightly pcarlacc- ous. Dimncter thrcc-cighths of an inch. F ound on mauy uf our coasts, adhcring to thc roots of Alg(l/, stoncs, the lcgs of crabs, &c. 5. ANOMIA CYI.INDlllCA, pi. XXII, f. 7, 8. A1w111ia C!Jmbijonnis, First. Ed., pi. 3,1, f. 7, 8; Maton ami Hackett, Linn. Tr., VIII, p. 10,1, pl. 3, f. 6; Fleming, Edin. Ency., p. 98; Anomiri C!Jli11clrica, Schrüetcr, p. 3, pi. 9, f. 9; Hrown, Ency. Ilrit., p. ,122; Fleming, p. 395; Turton, Biv., p. 232 ; Forbcs, p. 3!). Shell oblong-oval, convex, somewhat cylinclrical; beaks re- cun•cd, m11-ro,1·cr towards thc umboncs; upper vah-c convex, and curving over the nnder one, which is concave arnl smooth; snrface of uppcr vah·e dull brown, with a fcw transverse, obscure wrinklcs. J..ength half an inch; brcaclth a qnarter. Inhabits many of our coasts, adhering to P11ci, Sc1·t11la1·ia, &c. 6. Al'-OMIA EI.ECTRICA, pi. XLVI, f. 5. P,,tcllct pcllucicla, First Etl., pi. l O,~' f. 5; Brown, " 7 ernerian i\fom., ll, p. 5 M; A110111i<i clcct·1·ica, Linné, Syst., p. 1151 ; Chemnitz, VIII, p. W, pi. 76, f. 691 ; Turtou, l3iv., p. 226, pi. 17, f. s, !). Shell orbicular, vcry thin, pcllucid, slightly wrinklcd concen- trically; umho small and margined, b clow which is a chalky-likc spol, of a roundi~h shape; uppcr valve vcry corn·ex; under rnlve ,·ery llat, with an cxtremely largo interrupted pcrforation; whole ,hcll of a bright. ambcr-colonr. Diamcter about an inch. I first founcl this species al Color Cots, ncar Tyncmouth, an<l aftcrwards al Dublin Ilay ami Portmarnock, lrcland. ,. A:-0~1u CEPA, pi. XXXIX, f. 12. A11omi11 cepa, Linnc'.-, Syst., p. 115 l; Chcmnitz, VIII, p. 85, pi. 76, f. (i9-I, 6D5; Turton, Biv., p. 229, pi. 18 , f. 4, young. Shcll gcnerally oblong, suboval, comprcssed, an<l rough cxter- nally, but not uu<lulating; beaks terminal; under valve thin, but not scaly; yellowish fawn-coloured extcrnally, an<l rosy recl within. Lcngth nearly two inches; brca<lth onc a11CI a half. Young shclls are somewhat triangular, with their si<les ob- tuscly cut down. Foun<l by Dr. Turlon, near Broaclsan<ls, Torbay, at thc very lowest Spring tide. 8. ANOMIA l'UNCTAT,\, pi. XXXIX, f . 13. Anomi<t pwictata, Gmelin, Syst., p. 3346; Chcmnitz, VIII, p. 88, pi. 77, f. 698; Turton, 13iv., p. 231, pi. 18, f. 1 l. · Shell orbicular; bcaks tennin~l; npper 1·alve convex, coverc<l with nmncrous raised dots; un<ler valve flal, with small and numerous punctures; base somcwhat truncated. Diamctcr about an inch. Found 011 crabs :,.ll(I shells, on the soulh coasts of Englancl. 9. ANOMIA F0llNICATA, pi. XXXIX, f. 1'1, ]5. Anomia jomicata, Lamarck, VI, pt. 1st, p. 228; Turton, l3iv., p. 23,1, pi. 18, f. 12, 13. Shcll dirty white, somcwhat orbicular, compressecl, fincly striated; upper valYc com·cx, provided with a vaultcd chamber near the back; hingc pointed, an<l ncarly terminal; sidcs near the margin irrcgularly sinous, with numerous, very !ine, racli- ating stri.:c, an<l with fine, regular, trans1·erse stri.:c ncar the hingc; under rnlvc flat, with the pcrforation rouncl, all(l ncarly closcd;. inside of a sih-ery metallic lustre; margin pro,·iclecl with fine, longitudinal stri.:c, 'the hollow vaulted chamber, which is considerably curved on one si<le, an<l scaly externally. Dia- metcr about half an inch. Found at Torbay. 10. AKOMIA STRI0LATA, Anomict striolata, Turton, 13iv., p. 233. Shell oval, somcwhat cylin<lrically convcx, an<I longituclírrnlly striate, with recurve<l beaks. Dr. Turton says this shell rcsemblcs the A. C!)limfrica, in ali respccts, "but is always marked with fine, rather remole, longi- tudinal raised lincs." Found in thc roots of Puci. l l. AK0MIA TUUULAlllS. Anomi<, tubulctris, Turton, 13¡,,,, p. 23,1. Shell cream-white, orbicular, 11·ith the perforation of thc uncler valvc entirc ali roml<l, and forming a raised cylindrical tubc; bcak terminal; plug tenclinous. Found attached to Ftcci. The two latter shells are 1•ery doubtful species; they are given 011 thc authority of Turton. GEKUS 4~OSTRE,1.-Linn.cus. Shcll inequivall'c, irregular, a1HI foliacoous; umboncs sonrc- what separate<l, ami of unequal sizc ; lower rnh·e largcst, con- ca,·e, ami frcc¡ucntly aclherent; upper mire smaller, and some- what plnin; hinge dcstitutc of tccth; ligmnent par!ly externa!; the facet to which it is altached is suhtrigonal, tripartitc, and di,·ided by two elel'atcd lincs, which clirnricatc from the umbo; ench , ·alve prol'i<led with two muscular imprcssions, thc onc Jargc, suborbicular, ancl nearly central, thc other very small, a1HI situate near the !tinge.