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

PnoLADAnJA.] MOLLUSCA. 113 Tmton says that this shell in every respect resemblcs Solcn Silit¡ua, excepl in the teeth; in the S. Ligufo the single tooth is comprcs:;ecl, rounclcd, obtnsc al thc top, ami slightly clcft. Turlon founcl it pl~ntiful in thc sands al Tor Abbcy, whcre al low watcr-mark it may l'asily be obtainetl aliYe. 4. S01.EN fü,s1s, pi. XLVII, f. 10, 10. Solen E11si$, First E1!., pi. 1:1, f. :O; Montagu, p. <18 ; Dono- ,·:111, TI, pi. 50; Turton, Iliv., p. 82; Flcming, p. 458; Forbcs, p. iíG. Shcll considerably arcuatecl, subcylimlrical, truncatccl at both extremities ; thc anterior side oblique; a triangular arca takcs its rise closc to thc umbonal region, ancl terminales on thc opposilc side; striatcd ami colourecl likc S. Siliq1w; hingc with a single, lateral, cardinal tooth in one ,•ah-e, locking be- twcen two tecth in thc opposite valve, which is providcd with a strong, eleYatcd, slightly rccurvc<l, c:lcft, lateral tooth for the rcccption of thc oppositc simple onc; strong, clcvatcd, lateral lamina, with a rounded tcrmination, in both Yalvcs, takc their risc closc to thc base of the cardinal tecth, extcnding to nearly a fourth of lhc brcadth of thc shcll; inside bluish-white. General length threc-quarters of an inch; breadth about five inches : but spccimens of much grcater dimensions have beco found in lreland all(\ the Orkney I slands. Not uncommon on many of the sancly shores of Britain an<l lrcland. 5. SoLEN PELI,ucmus, pi. XL VII, f. 4. Solcn pygmtcus, First Ed., pi. 13, f. 4; Lamarck, V, p. 452; · Solcn pcllucidus, Montagu, p. 49 ; DonoYan, V, pi. 153 ; Tur- ton, Biv., p. 83; Fleming, p. 459. Shell slightly arcuatecl, compressed, fragile, subpellucid; roun<lcd at both extremities ; coverecl with a vcry thin, yellow- ish-grecn epidermis, bcncath which thc surface is usually of a vcry pale ílesh-colour; umbones situatc ncar to onc si<le; hinge with a single, sm:ill tooth in onc valvc, locking bct.ween two in the oppositc onc; each nlve provicled with lateral tccth; in- sicle white. Length a quarter of an inch; breaclth somewhal more than an inch. A local spccies, found al Sandwich, Cornwall ; Ilccl Wharf, Anglescy; Torbay, DeYonshire; Portmarnock, Irclancl; Porto- helio ancl Musselburgh, Scotlancl. GENUS 4•1.-SoLENocunTus.-De Blainvillc. She\l transversc, elongate<l, equivalvl', subequilateral; thc !tinge ami basal lincs ncarly parnllel ; cxtremitics truncatecl, or rou11cled, ami gaping; umboncs harclly dcYclopccl an<l subccn- tral ; surfacc invested by a very thin epidermis; hingc with or without thrcc rndimcntary, cardinal tecth, ancla prominent bar rcaching nearly half across the rn\Ycs; ligament prominent, scate<l upon thick callosities; two clistant, roundccl, muscular impressio11s in cach vah•c, .ºº~ situat~ towar'.ls the ~road~r side, thc othcr subcentral ; pallial 1mprcss1on strmght, w1th a s111us al thc broadcr cm!. 1. SoLENocunTus LEGUMEN, pl. XLVII, f. 8, 9, !).• Solcn L egumcn, First Ecl., pi. 13, f. 8, 9; Pcnnant, IV, p. 84, pi. 4G, f. 2,1; Montagu, p. 50; Donovan, II, pl. 53; La1~arck, V, P· •153; Plwrus Lcgumcn, Lcach, i\'.ISS., P· G; Flemmg, P· •159; Psm11mobia Lcgm11c11, Turton, Dl\'., P· 90. 2 ¡.• Shell grcatly clongatcd transYcrscly, thi11, ami subpellucid; umboncs subcentral, hardly perceptible; surfoce smooth, with fine, irregular, shallow, conccntric stri:c; coYcred with a ,·cry thin, ycllowish fawn-coloure<l epidermis, which is frcquently decorlicatcd towarcls thc hinge ami 011 thc superior portions of thc shcll; shortcr sidc broad, aud gcntly tapering towards the opposite cxtrcmity, where thc Yalres are more acutc, ancl slightly subtruncatcd; hinge with two small, crcct, recurrcd, cardinal tecth in one Yah·e, betwcen which an erect, thin tooth in the opposite valre is locked ; in both YalYcs is a parallel, arcuatccl, hook-likc sidc tooth, continucd by a prell y long, laminar proccss, or lateral tooth, on which thc ligmnent i~ seatccl; 011 thc opposite si<lc is a lcngthenccl, strong riclgc, reaching from the cardinal tccth 11early to thc sicle of tlw valves; insicle white, or palc flcsh-colour, ancl glossy. General lcngth at !tinge ncarly seYen-eighths of :in inch; breadth four inchcs: but somctimcs fonncl considcrably largcr. A local spccics, found 011 the uorth coast of Deronshire, 1-Iampshire, Cacrmarthcnshire, Swansea, of a superior size 011 many of thc lrish coasts, an<l is plcntiful on the easl coast, from Cork to Belfast. GENUS 45.-Azon.-Lcach. Shc\l transverscly oblong; umboncs blunt, ami situatml nearly central; gaping at both si<lcs; hingc with onc c1·cct, clerntccl, recurYecl tooth in onc ya\ve, which fi ts bctween t.wo crl!cl, rccurvecl tecth in the opposi te onc, ali of which projcct co11- siderably above the commissure, or hinge line of thc \'ah-es ; cartilage externa\; two large muscular imprcssions in hoth valvcs; pallial impression interrupted by an cxtrcmcly largr, ascending, tonguc-shapcd sinus, which extends nearly to thc umbones. l. Azon ANTIQUATUS, pi. XLVII, f. G, 7, S olcn antiquatus, Firsl Ed., pi. 13, f. 6, 7; Lamarck, V, p. 454; Maton and Ilacketl, p. 4G; Donornn, IV, pi. l 1•1; 1\1011- tagu, p. 52; Donornn, IV, pi. 114; A::-01· a11tit¡uat11s, Leach, MSS., p. G; Psammobici antiquata, Fleming, p. 460; Turton, p. 91; Solc11 cmtiquatus, Sole,~ cultcllus, Pennant, IV, p. 85, pi. 4G, f. 25. She\l transvcrscly oblong-ovate, thin; umbones straight, placed nearly central; si<les roun<lcd, a11tl gaping; colour whitc; coverecl with a moclerately slrong, yellowish-brown epidermis, beneath which the surfacc is covered with fine, somcwhat irre- gular, concentric stri:c; hinge with a single, clevatcd, crcct, curved, reílecte<l (ooth in one \':th-c, which locks betwecn two reílcctcd tccth in the oppo,ite onc; inside smooth, glossy, white, or bluish-white; margiu plain. Found on the coas!s of Cornwall, Dorset, l·lampshire; ami Dublin Bay an<l Portmarnock, Ircland. FAMILY X.-PnoLADARlA. Valves providc<l wi th acccs,ory picccs; or gaping consi<lcra- bly anterior\y. GEl-.us 4G.- GAL"EO)IMA~Turton. Shell thin, generally o\·al, equivalve, equilatcral ; ventral, or basal margin gaping widcly; a single, small, cardinal tooth in each vah·c; two lateral, indistinct, somewhat approximatc, mus-