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

20 MOLLUSCA. ['fnACHEL!PODA. 2 • D. dcpmsa, pl. VIII, f. 35, 36. Fi~st E,.<1·• p)· 51, f. 35, 36: Tur- Jlc/iz dcpl'clla; !lfontagu. p. <1;39, pi, l;,, f.•"; _'l urbo ~cprcssus, ll 't F n p 185 · Skc11ca dcprcssa; l·lcmmg, l:lr1t. An., 313. tou, r1 • au ., • , . 1 · • SI 11 bdcpressed subpcllucid, w1th thrcc or four vo uuons; s¡mc we11 1 Jcfi:~d by thc s~ture, but scarccly clcvated abo,·c thc bod~,. an~ .¡-"¡ ti vrinklcd·across-; apcx distinct, but not produccd; b?dy C}lm_dn- s 10 1 1 b y ' dcd -ith a Jnrgc umbilicus, in which. the superior \'Oluuons en , ase rou11 , " . ¡¡ <l <l t r •urc obicular, the lips contmuous, cven a roun , an no are sccn ; apc • . ¡· ¡ 1 · ti body J,ut sprca<lin.,.sli<>htly u¡,on 1t; colour of a 1g 1t brown. e aspmg 1c , . " o Diamctcr hnr<lly a lmc. Foun<l at Wl.ijtsan<l l3ay an<l Falmouth, Cornwall; Burrow lsland, Devonshire; ancl at Dunhar, Frith of Forth. 3. D. 1crpulo,Jca, pi. VIII, f. 40, 41; First E<l., pi. 51, f. 40, 41. Ifcliz scrpuloidcs; l\fontagu, Sup., p. l-i7, pi. 21, f. 3; Skcnea serp1t• /Qidc,; Flcming, llrit. An., p. 313. . . Shcll comprcsse<l, glossy, whitc, with thrcc smooth volut1ons; spirc but littlc clcvatc<l abovc thc bo<ly, and tcrminating in a small but not pointc<l apex; aperture orbicular, slightly adhcring to the bo_<l_y, a~<l turning consi<lcrnbly <lo,~mvar<ls, f~n".1ing a !a_rge and _<leep umb1hcus? m which thc superior voluuons are <l1stmctly v1s1blc. Diamctcr not a lme. Foun<l on thc Dcvonshirc coast, cxtremcly r.irc. This bcars sorne rcscmblancc to thc D. dcprcssa, but differs in the slight conncction of thc volutions, and thcir more cylin<lrical form bcneath; it ditfors also in colour. Subdivision II.-Volutio11s Sinistral. 4. D. ,·cs11pinata, pi, VIII, f: 45 and 47; First E<l, pi. 51, f. 45 nn<l 47. Jlcliz rc,upinata; Montngu, p. 4'14; Walker, Minute Shclls, f 24. Shcll with three reversed volutions, a111I terminating in an obt~se npex; apcrturo lnrge, oval, nn<l not spreading on the body. G1rnus 22,-Sl'IIIA.-Ilrown. Shell smooth, ncarly globular, or scmiovntc; spirc small in pro- portion to t.hc sizc,or die body, un<l <lepresse<l; aperture envelopiflg the body. l. C. globosa, pi. VIII, f. 3•1 un<l 37; First Ed., pi. 51, f. M ancl 3'7; Dcl1ilii11oidca globosa. llcli.1· globosa: llfontagu, p. 4•14; l\Inton a1HI Rackrt, Linn. Trans., VII 1, p. \!03; Walkcr, l\linutc Shclls, f. 25; Turton, llrit. I•'nun., p. IOO. Shcll smooth, whitc, opaque, glossy, an<l round, with two volutions, thc superior one slightly cle\'atc<l auo,·c the liocly; apcrture suuorbicular, al!ll clusping thc bocly; outcr lip thin, entire. Diametcr not a line. Fumul on thc coast of Sandwich. 2, C. 11itidissi111a, pi. VllI, f. 42 ami 44.-First EJ., pi. 51, f. 42 an<l 4•1; Dclplduoidca 11ilidissi111a, l/d,,.r 11itidissi111a; l\Iontagu, p. 4<17; l\laton and Racket, Linn. T-r:ins., V111, p. 205; Adam's Linu. Tr., V, p. G, pi. 1, f. 22, 23, 24. Shcll nearly globular, cxt,cmely glossy and· horn colonrc<l; pellucicl, with two volutions, íincly striatc trans,·ersely; base roun<led with a small, round umhilicus ; npcrture semilunar, em·cloping the body ; outer lip plain. Diamcter not a linc. · · · · - Found 011 thc coast of Pcmbrokcshirc. 3. C. coarc/alad>I. VIII, f. 43 and 52.-First E<l., pi. 51, f. ,¡3 ancl 52; Dcl¡ihi11oid.-a coal'clala. Hcli.r coa,.clala; l\lontngu, p. •l-17; Matan and Rackct, Linn. Trans., VIII, p. :!05; Walkt-r, l\Iinute Shclls, f. 30. Shell nearly globosc, whitc, nu<l pcllt1cid; with two volutions; borly \'et)' largo, superior \'olution cxtrcmcly smnll; apertnre subrotund, em- braciug the bocly contracted at the hase of thc columella; outcr lip thin ami plain; an cxtrcmely small umbilicus. Dir,mctcr uot a linc. Found at S:1111.lwich, ,·ery rarc. ,l. C. ,.c1ic11l11ta, pi. VIII, f. 3S, 39.-Firs t Ed., pi. 51, f. 38, 39; J)rfphi11oiclca rcticulala. llc/i.r rclic11/al11; Moutagu, ¡,. 4-1-1; l\laton and Rackct, Linn. Trans., VIII, p. 203; Admns, l\licr., pl.1,1, f. 12; Walkcr, l\Iin. Sh., f. 26. Shell scmiorntc, subglobular, whitc, nnd pcllucid, with two \'Olutions , spirally nud trans\'crsely s triatc; apcrture ncarly orbicular, clasping the body; mnrgin of thc outcr lip plain, :md <li1•cstcd of stri:c; liase with a sulmmbilicus. Diamctcr not quite a linc. l'ound nt Hccuhrr; cxtrcmcly rarc. b. C. bicolor, pi. VIII, f. 50, 51.-First Ed., pi. 51,_f. 50, 51; De/. vhi11oidca bico/o,., Jlcli.r bicolor; Montagu, p. 4-l í; !IIaton :rn<l Racket, Linn. Trans,, VIII, p. 20b; A<lams, Linn. Trans., V, p. •l. Shcll with two smooth, pclluci<l, but uot glossy yo)utions, of'l1 ycllow- ish horn colour; base pro\'idc<l ,with II vcry small 11mbilic11s. Tl.iis -specics diffors·from thc· C. 11iticlissima, in licing perfoctly smooth, not glossy, ancl in the in~ide of' thc shell licing whitc. 6. C. tub11/ala, pi. VIII, f. 46.-First Ed., pi. 51, f. 46; IJclpl,illoidea fobulata. 1 lle/ir t11b11/ala; Montag,1, p. 446 ; Maton and llnckct, Liun. Trans., VIII, p. 20-l; Aclam~, Linn. Trans., 111, p. 67. Shdl globular, with thrce longitudinally strintc \'Olutions, an<l a marginal tubc al thc base in place of an umbilicus, cxtcn<ling bcyond thc base of thc shcll. 7. C. varicgala 7 · Jleli.,· varicgala; l\fontagu, p . 446; A<lams, Linn. 'Trans., 111, p. Gí. Shell consisting of four sulipclluci<l, smooth \'Olutions, with ~e<l linea. tions; thc body ventricose, an<l impcrforatc at thc base; margn, of tlw apcrture very much sprcacl. GE:-.us 23.-PLANARIA,-Ilrown. Shell discoidal; spire <leprcsse<l ; the volutions apparent on both si<les, and encompnssed by the l>o<ly, or onter one; aperture trans- verse and semilunar, nn<l not clasping the l>ody. l. 1'.pellucicla, pi. VIII, f. 53-54-M.-First E<l., pi. bl, f. 53-54-55. Shell clepressecl, ,·cry thin, pellucid, whitc, an<l cxtl'cmcly glossy, con. sisting of fo111· rounde<l volutions, slightly wrinkle<l across, \'isible on both si<les .of thc disk; thc one ncxt the body abo ve ncarly parallcl with it, thc inner ones dcsccnding into a decp umbilicus; thc centre volutious cncom. passcd by thc Liocly ; apcrturc semilunar, transvcrsc, and obliquc; outcr lip thin, pillar lip adhering to and slightly reficcte<l on thc columclla.; liase ronn<lecl. Diame tcr a quarter of an inch ; thickness not an eighth. l'ound ort thc coast at Dnnbar, by General Bingham, an<l in his cabinet; ami wc ha\'e latcly met with it in the same locality. 2. 1'. alba, pi. VIII, f. 4S-49.-First E<l., pi. 51, f. 4S-49. Shell <leprcsscd, with four milk-whitc roun<lc<l volutions, ,·isible on both sides, cncompassc<l hy the bo<ly; the sccoud ones \'ery slightly 'Clc\'ated nbovc the sidos of the IJody, thc central oncs sinking into a dccp mnbili. cus; base roundcd, thc volutio1is rctiring towar<ls thc mi<lcllc, and winding to a small central nmbilicns; thc wholc crosscd by very minnle lines of growth, or obsolctc strim; apcrturc olilique, largc, suborbicular, :rn<l white within; outer lip thin ,and plain; pillar lip a<lhcring to the columella. Diamctcr thrcc-cighths of an inch, an<l nbout half that thickncss. Fonncl 011 Lhc hcach IJctwixt St Abb's Hcad and Dunbar b v Gencr:il Ilingham, an<l in his cahinct; and we hnvc lately found it clase' to Dun- bar. This specics has mnch the aspcct of l'la11orbis comcus, but cliffcrs from it in thc volutions of thc apical side, bcing thc reverse of that shell in thc insicle being parallcl with thc sidos of thc body, ami in thc othcrs bcmg thickcr :md lcss sunk than the undcr side of the P. cm·"cus, in its young state. GENUS 24.-Sc,tLARI,\.-Lamarck. Shcll turrete<l; rnlutions gibbous, very tlistinct, sometimcs quite separnted, with a spiral voi<l in place of a. suture, with closc or dis- tant, longitudinal, clernte<l, aeutc, ohlique ribs, sometimcs so thick- cne<l as to prcscnt a ,·aricase appenranec, but in a few ins:anccs se, deprcsscd that they hardly nppcar abovc the snrfaec; aperture for the most part orbicular, or gcncrally a little longcr than brond, with its margin united ali round, thickene<l, aml r cflcetcd, partieularly so in such spccics ns the \'Olutinns are apmt from each othcr; lowcr part of the columclla imlistinctly eanaliculate; aperturc providcd with a. thin, horny, spirnl opcrculum. 1. S. comm1111is, pi. V11I, f. 13.-First Ed., pi. 51, f. 13; Sea/aria com- mrmi.,; Lam:irck, VI, pi. 2;p- 22S; SC(dal'iaclall,rus; Flcming, Brit. An., p. 311; Turbo clallm,s; l'ennallt, Brit. Zoo!., IV, p. 12!), pi. 82, f. !l; ll!aton and lbckcl, Linn. Trans., V111, p . 1 í0 ; lllontogu, Su¡,. p. 120 ; 'l'. clalhralulus; Donornn, Urit. Sh., pi. 2S, uppcr figs. ; 'l'urbo •calaris; ll!ontagu, p. 296.