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

56 MOLLUSCA, [GASTEnOPODA 4. Ll~IAX AGRESTJS, pi, XVIII,• f. 20. . Limax agreslis, Linné, Syst. Nat., p. 1082, No. 6; Gmelm, L . S t Nat p 3101, No. 6; Müller, Verm., II, p. 8, No. mn. ys, ·• • S 204. Drapcrnaud, Hist, des l\foll., p. 126, pi. 9, f. 9; turm, Fau:Abthl., VI, p, I, pi, 4; Pennant, Brit. Zoo!., ry, P· 4~; Lamarck, An, San. Vert., VI, pt. 2nd, p. 50; Flemmg, 13nt. An., P· 256; Turton, Brit. Fau., p. 133; Pfciffer, I, p. 21; Nunncley, Trans. Phi!. Soc. Leeds, pi. 1, f. 4; Alder, l\fag. Zoo!. and Bot., II, p. 105; Thompson, Aun. ancl Mag. Nat, Hist., VI, p. 61; Forbes, Mal. l\fon., p. G; Limacell<, obliqua, Brard, p. 148, pi, •1, f. 7, S, 17, 18, shell; Limaceltus obliquus, Turton, Man., p. 26, pi. 3, f. 17. Shell \'ariable in form, ,·ery small, thick, hard, and of an oblong square, rounded al the corncrs; colour, pale yellowish- whitc, or gray; a little conca\'e, and providecl with a membra- neous eclge. This spccies is destitutc of thc abrupt thickcning in the centre of thc shell, which is so strongly characteristic of . L. ca1inat11s, Common in fields throughout Britain; Mr. Clarke founcl it in Qucen's County, ancl County of Galway, Ireland. Mr. Clarke consiclcrs L.filans, va,•, 'I of Férussac, as bclong- ing to this spccies. 5. LIMAX GAGA.TES? VAR,, pi. XVIII,* f. 21. Limaa: gagales? vai·., Férussac? Drapernaud? Limaa: No. 4, Clarkc, Ann. ancl Mag. Nat. 1-Iist., VI, p. 19. Shcll ornl, somewhat spoon-shapecl, pointecl above, ancl rounclcd below; mombranaceous, ancl subopaque. Mr. Clarke says this shell di[ers materially in sir.e and thick- nes;; from L. vm·iegat11s, being smaller, more membranaceous, nnd lcss opaque. The colour and markings of the animal are also very cliffercnt from other British species. :pisco,•ered by the llev. D. J. Clarke, of Tuam, at Spirc I·Iill, La Dergeric, Queen's County, Ircland, who has most obligingly scnt me the use of beautiful drawings of the animal ancl shell of this as well ns of all the other Irish Limacidre. He ~ays it is always fonnd on trees, and nevcr in cellnrs ancl damp vaults, &c., as L . va,-icg<1lus. l\Ir. Thompson, in his paper on the Land ancl Fresh ·water ?lfolluscn of Ireland, remarks, "It may be the L . ca1·inat11s of Leach, or L. gagales of Drapernaucl ;" but I do not think l\ír. Clarke's dcscription agrecs with either of thc above species. I think it more than probable that it is an entirnly new specics. D1v1s10N 11-HYDRODRANClll,1!, Thc branchi.c filamentary, or laminated, and pcctinated, or tuftcd. The animals respire in water. FAmLY II.-BuLLACEA. The branchi::c situate in a particular cavity, near thc posterior rcgion of the back, ancl covered by a maulle; animal destitule of lcntacula. Al\ thc animals of this family are clestitute of a branchial opcrculum, and the hcacl ,·cry indistinclly formccl. Sorne of them are cle,·oid of both ext crnal and interna! shell. In somc spccics it is conccalcd in the mantle, ancl in severa\ thcre is an externa! shcll attachccl by a muscle. The shells are so widened, that therc is no apparcnt colu- mella. GENUS 5.-DuLLA-Linnmus, Shell convolute, oblong, oval, or cyliudrical, with a depression abovc in place of a spire, the inner volutions being concave in thc exterior one; aperture longitudinal, as long, or longer than the eonvolutions, straitcned above and expanded below, in which situation it is di[use; outcr lip thin; columellar lip gcnerally reílectcd, with a coating of shelly matter. Sub-GemlS 1.-BuLLA,-L imueus. Sltell placed on tite posterior po1·tion of tite body of tite ani- mal, a11d provided with an epide1"TTIÍS, l. BULLA LIGNARIA, pi. XIX, f. 23, 24-First Ed., pi. 38, f. 23, 24. Bulla lig11a1·ia, · Linné, Syst. Nat., p. 1184; Lamarck, An. San. Vert., VI, pt. 2nd, p. 53; Pcnnant, Brit. Zool., IV, p. 126, pi. 70, f. 83; Montagu, Test, Brit., p. 205; Donovan, pi. 27; Fleming, Brit. An., p. 92; ·Maton and Ilackctt, p. 125; lb., Ency. Meth., pi. 359, f. 3; Forbes, p. _6. Shell oblong-oval, thin ; spire concealecl, subumbilicated, bcing cnveloped in the body volution; apcrture glossy, bluish- white internally, extcnding the whole length of thc shell, narrow above, ancl abruptly expanding below, terminating in a rounded base; outer lip thin at thc edge; inner lip pretty broadly rc- ílected over thc columella; surface transversely striate, of a pale reddish-ycllow, with numerous, transvcrse, burnt terra-sienna coloured doublc lincs, producing a wood-like appearance; lon- gitudinal lines of growth distinct, frequently intcrrupting thc transverse oncs. This beautiful shell is by no means uncommon in ali the seas around Great Britain and Ireland. On the coasts of the latter country it grows to a large size. 2. IlULLA ALOA, pi. VIII, f. 3.-First Ecl., pi. 51, f. 3. Bulla alba, Turton, Zoo\. Journ., 11, p. 364, pi. 13, f. 5; Fleming, p. 294. Shell cream-white, oblong-oval; no visible spire; apex um- bilicate; aperture extending the whole length of the body, narrow above, its lower half very wide, terminating in a wcll rounded base; outer lip sharp at the eclgc, and not elerntcd abovc the bocly; inner lip rather broadly rcílected on the colu- mella; whole externa! surfacc with slight longitudinal strire; at cach extrcmity, three transverse punctured striro. Dr. Turton rcmarks, "they are more elongated than thc B 11llc, am.pulla, and essentially differ in having only three rathcr remole, transver~e strire at each ene!, whercas in the latter thcre are seven or ein-ht strire on tlie ) t ·1 o , ower ex ren11 y, and none on the uppcr." Dredgcd in the 13ritish Channe\ by Dr 1, 1 1 I · d • ur on, w 10 says 1e gol s1x cad specin1ens in onc locality. 3. ilULLA Z0NATA. Bulfo :::onata, Turton, Mag. Nat. Hist., VII, J. 352. Bu/la. scaplu111de1·, Leach. I ' " Shell oval sol'd - ¡ I 1 ' 1 • opaque, wit I a ternate zones of white and fu vous, ami t_ransversc lines of minute raised dots. Length a quarter of an mch; brcadth ncarly as niuch.