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

1SVOI.UT!s.] MOLLUSCA. 25 :2. 1,~ Alcl,:1·i, pi. LXI, f. 1 ; Natica Alcleri, Forbes, Mala- •·ologia Moncnsis, p. 3 1, pl. 2, f. G, 7. Shcll ncarly globular; ,rith thc spire somewhat produced, acule, consisting of fire rnlutions, clil'icled by a shallow suture ; the lower ,·olution largest, ancl rounclcd; thc uppcr 011cs uearly llat; smface smooth, purplish-brown, with lwo bands of plain yellow, which are cach bonlcrcd by two 11arrow ba11ds of white, ~pottccl with hrowu; lowcr parl of thc first Yolutio11 whitc; a clark brow11 bancl bouncls a1HI cntcrs thc umbilicus, \Yhich is neithcr grool'cd 11or striatcd; pillar lip brown and whitc, slightly reflcctcd 011 thc umbilicus; inside brownish whitc; opcrculum C0l'llC0US. Y 011ng shclls harn thc spirc lcss produced, and the markings paler. l\fr. Forbcs says, "this appears to be as generally distributcd 011 our shores as the last (N. monilife1'ltj, with which it has hitherto been confounded. Indcccl, I had for somc time (though not without doubts) regarclcd it as the young of the last, until my atlc11tion was directccl to its own young by that eminent conchologist, l\ír. Alder of Newcastlc. Since then I hal'e taken thc shcll of ali sizes, so as to lcare 110 doubt of the iclc11tity of thc larger spccimens with thc smaller." :~. N. ·intrical<t, pi. XIII, f. 13, 16.-First Ed., pl. 43, f. 13, 1G; Naticct inti-icala, Flemiug, Ilrit. An., p. 319; 1Yerita intri- cata, Donova11, Drit. Sh., V, pi. 167; 1Yerila canre11a, Montagu, Test. l3rit., Sup., p. 149. Shcll 11early globular, smooth, shiniug; body lai·ge; spire ,·ery small, consisting of three rouudecl volutions; colour livid, with bamls of sagittate, fcrmginous lines; umbilicus large, fur- nished with two divergent, spiral ridgcs and two groove~; aper- ture subovate, sublunate; outer lip smooth, thin at the edge; pillar lip broadly reílcclc<l 011 thc columella. Size somcwhat more than half an iuch. Fouud al \~ 1 eymoulh by Mr. Donovan, and I dredged a dcad shell in the Frith of Forlh. 4. N. 11fontagui, pl. XIII, f. 3, 6, 7, 11.-First Ed., pi. 43, f. 3, G; Natiect 11'lontagui, Forbes, lVIal. Mon., p. 32; Natica nifa, Flcming, Dril. J\n., p. 319; Ne1·ita 1·1ifn, :tlfontagu, Test. Brit., Sup., p. 150. Shell ovate, ~mooth, glossy; body large; ~pire small, con- sistiug of four rounded rolutions, separatecl by a rleep suture, terminating in an obtuse apex; aperture semi-ovate; outer lip thin al' the cdge; pillar lip white, narrowly reíleclcrl on the columclla; umbilicus deep, ancl hollowed by a spiral groove, which terminales in a notch on the columella, anda rib crossing half o,·er the opcning; colour lirid or purplish, with a white band invcsting thc superior portion of the volutions; insiclc yellowish orange. Lcngth five-tcnths of an inch; diameter one-eighth of an inch. Inhabits the Frith of Forth, in which locality a beauliful spe- cimen was found by my friend Dr. Knapp of Edinburgh; it is also met with on thc norlh coast of thc Isle of Man; but is a rare spccies. 5. N. glabrissima, pi. XIII, f. 9, 12.-First Ed., pi. 43, f. 9, 12; Nerita glabrissimus, 13rown, \Vernerian Mem., II, pt. 2nd, p. Ci32, pl. 24, f. 12. Shcll nearly globular, pellucid, bluish-white; body largc; spire small, llat, consisting of three decply dividcd volutions; covered with rather wide, oblique, longitudinal striro; aperture sublu- G nated; umuilicus long, narrow, and pointed al both extremitics; surfacc covered with fine, regular, longitudinal striro internally; aperture semilunar; outer lip very thin, acule al thc edge; pillar lip slightly rellected 011 the columella. Sizc one-eighth of an.inch. Foun<l in Dublin Bay, by Dr. Turton. 6. IV'. palliclula, pl. XIII, f. 12, 19.-Firsl Ed., pl. 43, f. 12, 19; Natiw pallichtla, Fleming, llrit. An., p. 320; :Nerita pal- lidula, Donovau, Dril. Sh., I, pl. 16, f. 1, 1; Da Costa, Brit. Sh., p. 51, pi. 4, f. •1, 5; Montagu, Test. l3rit., p. 46S; Browu, Ency. Brit., VI, p. •162. Shell orbicular, subpellucicl, of a light yellowish brown, or horn colour; body Yery large; spire extremcly small, consistiug of two, lateral, harclly produced, but well defined, ,·olutions; apcrture semilunate, very large, the externa) margins of thc lip as wide as the shcll; oulcr lip thin, its margin fringed by the epidermis protruding from behincl; pillar lip widc, white, con- cavc, with an elongated umbilicus, in its centre, coutractccl al both extremities; inside glossy ; whole shell corered with a rough, brown, epidermis, bcneath which the smface is nearly smooth, or faintly wrinklecl, lo11gituclinally. Lcngth ncarly half an inch; brcadth threc-eighths. Founcl on thc coasts of Kenl, Dorsetshire, and Falmouth, in Cornwall; ancl thc Frith of Forlh; it is, howcrer, a rarc specics. 7. N. tubei·osissima, pi. XIII, f. 18, 20.-First Ed., pl. •1:J, f. 18, 20; 1Yatica tube1·osissima, Fleming, Brit. An., p. 320; 1Vel'ita tuberosissima, Montagn, Test. l3rit., Sup., p. 150, pi. 29, f. 5. Shell orbicular; body very large; spire extremely small, con- sisting of threc volutions, harclly elevated above thc liody, 011 which there are four elevations broken into tubcrcles; npcrturc nearly circular ; pillar lip narrowly rcllected on the columelln; umbilicus large. Diameter somewhat more than onc-eighth of an inch. Said to have becn <lrcdgecl in clcep water, in the Frith of Forlh, by Captain Laskey, ·a single live specimen only occurring. It has much thc aspect of a foreign shell. GEN us 32.-NERITOJDES,-Drown. Shell strong, thick, subrotund; spire depressed; aperture nearly round; outer lip almost continuous, having a slight groove only al its junction with the body; dcstitute of an umbilicus: operculum ncarly circular, horny. 1. N. littornlis, pl. XIH, f. 14, 15, 21, 22.-First Ecl., pi. 43, f. 14, 15, 21, 22; Nerita littoralis, Da Costa, l3rit. Conch., p. 50, pl. 3, f. 7, and pi. 4, f. 2, 3; Donovan, Brit. Sh., I, pl. 20, f. 2; Montagu, Test. Drit., p. 467; Fleming, Brit. A n., p. 318; Litto1·ina Ne,·itoides, Forbcs, Mal. Mon., p. 19. Shell scmiovatc, strong, thick; body large; spire small, con- sisting of threc or four volutions, which are placed laterally, ami sometimos quite depre,sed, and in others produced, and dh•idecl by a slight suture, hardly perceptible al the apex; apcrture suh- orbicular, in sorne specimens inclining to OYal, smooth, whitc, purplc, or orange within; outer lip thin at the edge, considerably thickcn·cd within; pillar lip smooth, reílected on the columclla; whole shell covered by a thickish epidermis, varying in eolour, mostly of a drab, and frequcntly of an ora11ge-ycllow, red, or