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

[GASTEROPODA 66 MOLLUSCA. This shcll has much thc aspéct of thc following spccics, ~u t dilfcrs in the margin bcing n1uch broadcr, thc w.hole shell .bemg h blon " in the vah•cs bcing longer III proport1on to mue more o o• • 'd ¡¡ h · b dtl •nd also in bein" more elevated III thc 1111 < e t e1r rea 1, " o than that shell. · Found nt Ncwhaven, Mid Lothian, adhering to an oystcr, by General Bingham. Thc late Rev. Dr. Goodall, Provost of Eton Collcge, found this very clegant species at extreme low wnter-mark, on a stone at Tor Abbey rocks. In his spccimcn the valves wcre of a clark livcr-colourcd brown, with a double spot of pale green on each ; thc trans\'Crse striro, which pro- duce thc shagreened appearancc, were exceedingly minut~. He had mistaken it for the C. la:vis. The magnificent spcc1- mcn from which fig. 15 as wcll as fig. 12 wcrc drawn, were dis- covered at Oban, Argyleshirc, ancl prcsented to me by my late friend Captain Charles Carmichael, an accuratc and zealous naturnlist. 6. Cl!ITON nunEn, pi. XXI, f. 6 ancl 9, Chiton 1·ubci·, First Ed., pi. 35, f. 6 and 9; Lowe, Zoo!. Journ., II, p. 101, pi. 5, f. 2; Brown, Ency., p. 401; Forbes, P· 37. Shell carinated; valves broad, quite smooth, polishecl, and shining, deslitutc of punctures or granulations, but with numc- rous, rather faint, irregular, transversc striro, or linos of growth, which are more determínate on the sidcs of the valves, wherc thcy are longitudinal; margin broad, with irrcgularly granose, or farina-likc dots; whole surfacc with biight recldish-brown, or burnt sienna-colourcd clouds, spols, or undulations; marginal fringe of a light red-colonr, all(I not vcry clistinct; midel le valves providcd with two marginal teeth; first valve with nine teeth, ami thc terminal one with ten. Length threc-eighths of an inch; brcaclth about a quarter. Found in deep water in thc Frith of Forth; on the coasts of Argylcshirc, Yorkshire, Northumberlancl, and Durham; ancl Lough Strnngfürcl, ) reland. It is a rarc spccies. 7. C1111'0N MARGINATUS, pi. XXI, f. 3. Chiton mm-ginatus, Firsl Ed., pi. 35, f. 3; Pcnnant, IV, p. 71, pi. 36, f. 2; Montagn, p. l; Maton and Ilackctt, p. 21, pi. !, f. 2; llrown, Wernerian Mcm., II, p. 503; lb., Ency. I3rit., p. ,103; lb., Popular Ency., II, p. 378, pi, 17, f. 103; Chiton cinc1'cus, Lowe, Zoo!. Journ., II, p. 99; Forbes, p. 37. Shell a little carinated, ovoid; valves but slightly beakcd; whole surface CO\'ered with regular, shagreen-like granulations; colour various, frequently dusky, or drab, and sometimes niot- ~ICll; nmrg'.nal ligament with five meal-like, irregular papilli, 1ts cdges mth a minute fringe of a dusky hrown-colour; the first \'alve with about ten marginal teeth, and thc terminal one with twcl\'e. Lcngth about five-eighths of an inch; breadth three-eighths. l~ound_ in decp wate'. 011 m:~1.1y of the British coasts, namely, DC\onslnrc, Dorsctslnre; l;nths of Forth "nll CJ •d . d D bl . I' I " ) e , an u 111 ,ay, reland. s. CIIITON CIKEREUS, pl. XXI, f. 18. Chito11 ci11c1·cus, First Ed pi 35 f 18. "·I t . 3 ., • , • , 11 on aou p • Flcming, p. 289; lb., Ency., p. 102; Brown E , "n' · . ' i\I I l ., k , ncy. nt., p. 402; . aton am ,a~ ·ett, p. 22, pl. 1, f. 3; Forbcs, p. 37. Shell ornl, broad m proportion to its leiiotl ti fi . o 1, 1e 1rst ami ~ermmal \'alvcs ~roadly rounded; valves very slightly. elerntcd m thc centre, w1th bluntcd bcaks • whole shcll :ti fi • ' \H I ne, ure- ,,ular shan-rcen ; rnargin with irregular, eleva! ccl papilli, an<l ;lightly fringecl at thc cdgc; whole surface, including thc mar- gin, of an uniform dusky .ash-colour. Length somewhat more than a quarter of an inch; breadth not so much. Founcl on thc coasls of ,veymouth ami Poole, adhering to rocks ami oystcrs; ancl has been rnct with in the Frith of Clydc. 9. C!ll1'0N l'USC,\TUS, pi. XXI, f. 17. Chitonfuscatus, First Ed., pi, 35, f. 17. Shell oval, of a dusky brown-colour; the valves but little elevatcd, ancl slight.ly pointed; their surface, as well as thc rnarc,inal Jio-amcnt -which is very narrow,-covcrccl with fine o o ' shagrccn-like papilli; ami the outer cdges of the valves with longitudinal stri:c; destitutc of a fringc on the edgc of thc bor- der. Lcngth nearly thrce-quartcrs of an inch; breaclth about five-eighths. Fonnd adhcring to oysters in thc Frith of Forth; ami undcr stoncs, at vcry low water, at Crammoncl, Ircland. 10. CHITON ALDUS, pi. XXI, f. 2. Chiton Albus, First Ed., pi. 35, f. 2; Montagu, p. 4; Maton ancl Hackett, p. 22, pi. 1, f. 4; Flcming, Brit. An., p. 290; lb., Edin. Ency., p. 103; Brown, Ency. 13rit., p. 402. Shell oval, white; with thc valvcs but little raiscd, short in proportion to their brcaclth, ami vcry slightly pointccl; wholc surface co\'crcd with minute puncturcs; border ralhcr dusky, with dccussatcd strim, proclucing a fine shagreen-likc appear- ance, when vicwed through a strong lens, and cleslitutc of a fringe on its edgc. Lcngth thrcc-eighths of a11 inch; breadth somewhat lcss. Found on oystcrs in the Frith of Forth, and at P oole, Dor- sctshirc, and is invariably a decp water spccies. 11. CHITON AsELLus, pi. XXI, f. 14 ami 19. Chiton Asellus, First Ed., pi. 35, f. 14 and 19; Ency. Mcth., pi. 161, f. 12; Lowc, Zoo!. Journ., II, p. 101. Shell subcarinated; valves slightly beakcd, covered with moniliform, or chain-like granulations, dispose'd in the forro of longitudinal, slightly obliquc stri,c; marginal ligamcnt rathcr broad, with black, shagrecn-likc granulations, and providcd with a slight fringc; thc wholc of thc valves destitutc of marginal teeth, but with thcir interna! edges minut.cly crenulatccl, or granuloso ; colour variable, sometimos chocolate-brown, and at others olive-green. Length about three-eighths of au inch; brcaclth somcwhat more than a c¡uartcr. Lowc says, "in young specimens thc posterior edges of thc valves are dark brown, or black, which extends over about half the valvc; in older shells this colour becomes clecper, ancl cx- tencls graclually over thc whole of that part of cach vah·c, which is covered by the prcccding as thc shell contracts in drying." Fig. 14 is a grcatly magnified figure of a specimen, scnt to me by Captai11 Carmichacl, in which thc val ves are green, ami the bordcr brown. This species is found ncar Oban, on the Argylcshire coast. 12. C1U1'0N ASELLOIDES, pi. XXI, f. 21. Chiton Aselloiclcs, First Ed., pi. 35, f. 21. Shcll ovoid, carinated; vah-es ,,·ith a slight bcak, thc fir,t ami terminal oncs with eleven or twelve tceth, 111iddle ones wilh two cach ; wholc surface covered with minute, regular granulations, but not b:adccl as in lhe preceding species; mnrgin black, with coarse ra1sed granulations; fringe very short, ancl inclistinct ;