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

PEDUNCULATA,] MOLLUSCA. 119 Found on driftecl wood, on severa! of thc British and Irish Gi::::-:us 4-SCALl'ELLUM-Leach. Shell h1terally compresgccl, suhquadrate, acuminated above. an'.1. composed of thirt.een rnh·es, one pair acuminated and ap1c1al, another pair ventral, two pair lateral, and an arcuatecl olll~ on the ba<'k; altachecl to extrancous substanccs by a short scaly, or hairy peduncle. ' J. SCAL\'ELLUM VUl,GAUI::, pi. LI, f. 7, 9, 10. Scalpcllum vrdgm·c, First Ecl., pi. 5, f. 7, 9, 10; Leach, ~n_cy. füit. Sup., Cirripeclcs, pi. 57; lb., MSS., p, l ; Pol- lrc1pcs scalpcllum, Lamarck, V, p. 407; Brown, Ency. Brit., VI, p. 403. Pcclunclc horn-colourccl, scaly, altenuatc<l below, and covere<l with smooth scales; shell compressecl, provi<le<l with thirteen horn-coloure<l valvcs, with obsolcte striro. Founcl on many of thc British an<l Irish coasts, a<lhering to rollen timber, &c. Varicty a, f. 7. Valves closc, st?-ongly st?-iatccl concentri- cally ; pndunclc -with thc scales set in 1·egula,· rows. S calpcllum vulga1·e, Leach, Ency. Brit. Sup., pi. 57. Viiricty b, f. 9, Valves considembly apa,·t, subst?-iated con- centrically; peduncle with close-sct, imb,·icatcd scales. In Lady Jardine's cabinet. Va,·icty c. Valvcs all separated, and concenfrically subst1·i- ated; siclc valves witlt a ccntrnl, ¡n·ojccting point; peclunclc u:ith the scalcs set fa 1·egula,• amwlations. Donovan, pi, 166, f, l. 2. ScALPELLUM s~nuuM, pi. LI, f. 8. Scalpellttm vulgarc, First E<l., pi. 5, f. 8; Smilium Peronii, Sowerby, Conch. Man., p. 260, pi. 2, f. 36; Lepas scalpellum, :ilfontagu, p, l S, pi. 1, f. 4. Shell consisting of thirtcen smooth, light brown valves, ten of them in pairs, placed laternlly, and subtriangular; one situated posteriorly; pP.duncle with annular, scaly proccsses, slightly imbricated, and beset with nnmcrous, fine, short hairs. Found al Sandwich and Plymouth, in deep water. GENUS 5.-PENTELAsms.-Leach. Shell laterally compressecl, conical, and composed of fivc va\vcs, held together by a membraneous, ligamentary proccss; lowcr valves the largest, of a subtrigonal form, a little convex, and acule at their anterior base; upper lateral pair elongated, and subquaclrate, dorsal one lanccolate, carinatcd, and arcuated; scated 011 a peduncle, which is of variable lcngth. l. PENTELASMJS ,\NSEnJFERUS, pi. LI, f. l. Anatifa striata, First Ecl., pi. 5, f. l ; L epas anse1·iferus, Montagu, P· 16; Donovan, pi . 166; Malon an<l Rackett, p. 28. Shell comprcssecl, bluish-white, and glossy; largcr ~al:cs somcwhat inflatccl behind; four of them with strong, radiatmg striro assuminrr thc character of furrows towarcls the margins of the 1'.alvcs, which are crossed by very fine striro, giving them a faint reticulatccl appcarance ; anglcs of the valves sharp, cspe- . 11 ti · · ¡ ne. dorsal valve compresscd at thc sides, and c1a y 1c ap1cin o , , . broucrht to a fine carinatcd margin; supenor vnlves much com- o • ¡ h ¡¡ •t ely thin and flat on the pos- prcssed, ren<lcrmg t 1e s e ex rem tcrior sidc. Length an inch; brcadth threc-quarters. coasts, 2, PENTELASMIS STIATUS, pi. LJ, f. 4, 5, (i, Anatifa sti·iata, First Ecl., pl. 5, f. 4, 5, 6; Le¡;as sulcata, :Montagu, p. 17, pi. 1, f. 6; Matan and Rackctt, p, 29. Shell compressed, subtriangular; the inferior vah·es with fi f. leen slrong ribs, di\·erging from the lowcr anterior an,,le ; that which runs along the front is largcr than thc othcrs, n~ul formg a margin; the two superior vall'es tcrminating abo,·e in an ncutely pointed apex; with sc,·en or eight ribs, and small!'r intermediatc ones, dil'erging from thc posterior margin; dorsnl vah-e somewhat compressed, with strong, longitudinal stri.c, and a smooth, subcarinated edge; colour yellowish-white; peclunch• shorl, dusky. Length a quarter of an inch; brcadth ncarly thc same. Found allached to Go,'{JOllia jlabcllum, on thc Dorsetshirc coast, near Portlan<l Island. Vm·icty b, f, 5, 6, Lepas sfriata, Wood, Gen. Conch., p. 164, pi. 10, f. 5; Leach, Ency. Bril. Sup., Cirripedcs, pi. 57 ; Pentclasmis pumi- cicola, Leach, l\:ISS., p. l. Found on many of the coasts of Britain and Irclancl, nttach- cd in clusters to rollen wood, stones, &e, Montagu mention~ its having been foun<l on Go1'{Jo11i<, jlabcllum, near Portlancl Island. 3, PENTELASMIS ANATIFEHUS, pi. LII, f. 1, 2, 3, 4. Anatifa L cevis, First Ed., pi. 4, f. 1, 2, 3, 4; Lamnrck, V, p. 404; Pentclasmis anatifcra, Lcach, MSS., p. l ; Lepas mw- tifc1·a, Pennant, IV, p, 74, pi. 38, f. 9; Donovan, I, pl. 7; Montagu, p. 15; Mnton and Rackett, p. 28. Shell compressed, of a bluish-white, aml vcry glossy ; two lower valves somewhat triangular, longitudinally wrinkled, with nearly obsolctc stri.c, ra<lialing from thc lowcr interior anglo; two superior valves clongated, and tapcring to an obtusc point, upper portion angulated on bolh sides, apex rounded, thcsc have likcwise obsolctc, radiating striro, and are longitudinally wrinkled from the upper posterior anglc; dorsal valve long, slender, arcuated, smooth clown the micl<llc, ancl sulcnted on the sides; connecting cartilage and pedunclc of a reddish- orange, frequently inclining to scarlet, the lntler cxtremcly variable in length, as will be seen from thc dilferent specimens figurcrl; in a solitary inslance, we met with it of a pale hrow11, as in flg. l. Found attached to picccs of rotten wood, on many of the British ancl Irish coasts, and is the most common specics of the genus. Fig. 2 and 4, the more ordinary form of the spccies, Fig. 1, more dilated, the dorsal vah·e appearing as if jointed. Fig. 3, a rare variety, with the largcr 1·ah-es more dilntcd tlum usual, and with stro11g striro. In the cabinct of Mr. Albany Hancock, Newcastlc-upon-Tync. •1. PENTELASMIS DENTATUS, pJ, LII, f, 5, Anatifa de11tata, First Ed., pi. 4, f. 5 ; Lamnrck, V, P· 405 ; Brl1cruicre Dict., No. 3; Lepas dentata, Dilhvyn, Cat., P· 32. 0 ' 'h h' Shell with vcry smooth, glossy valves, of a blu1s -1~ 1te ; ngreeing in every particular with thos~ of 1:· anati_(etus, exccpting the dorsal valvc, which is prov1ded w1th a senes of obliquc, saw-like teeth; peduncle short, and of a pale scarlct colour.