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

SRSSll,IA.] MOLLUSCA. 121 Shcll subconic, depressed; with from scventeen to nineteen uearly cc¡uidislant, di\'crgcnl, smooth ribs, cxtcn<ling consi<lcr- ably bcyond thc base, which is ncarly circular; in somc in- stanccs two or three are situatc closer to each other than the rcsl; aperturc small, subo,·ate, with its edgc very regular ami cn~n; uperculum palc pink, four-,·ah·cd, and very obtuse al the apex; anterior \'all'es striated obliquely. Nut uncommon on many of the British an<l Irish coasts. Thc Yery dislincl ami charctcristic specimen from which we made our 1lrawing of lig. 3, pi. LIV, was foun<l at Seaton, Northumberland, by \V. C. Trcvelyan, Esq., ali(! is in the cahinct of Sir John Trcl'clyan, Bart., at Wallington. 5. BALA:-.US CANDIDUS, pi. LIV, f. 8, 9, 10, 11, 12. Balcmus Scoticus, First E<l ., pi. 6, f. 8, 9, 10, 11, 12; Bala- nus cancliclus, Leach, MSS., p. 2. Shell conical, nearly smooth; wilh six unequal valves, longi- t udinally wrinkled, and Yery remole, nearly obsolete stri.o on the raised portions ; aperture 1•ery large, exlremely irregular on the edge, inlernally slriatc transvcrsely; operculum abruptly conical; posterior valvcs with serrated externa! margins, and zlriatcd t ransversely; anterior Yalves with numerous, strong, transverse ribs, which are crossed by many fine, longituclinal ;;triro, producing a decussatcd appearance, ancl with their inter- na! margins serrated. Fig. 11, 12, the operculum. Fig. 8 is an elongate<l, cylindrical variely, found on the Devonshire coast, by Dr. Lcach. The species seems very variable in form. This is the largest specics of Balanus found in our seas, ami seems pretty widely cliffusccl. Fig. 10 was founcl by W. C. Trevelyan, Esq., at Hartlepool, adhering to a specimen of Fusus cmtiqims. Fig. 9 was figuree! from a spccimen in the British Museum, and clreclged in the Frith of Forth, where it is not uncommon; and I have lately procurecl sorne large and beautiful specimens from the Irish coast. 6. BALANUS ScoT1cus, pi. LIII, f. 1, 2, 3, ancl 22. Bala1111s Scoticus, 'Wood, Gen. Conch., P· 40, pi. 6, f. 3. Shell subconic; surface divided into irregular, triangular compartments, obsoletely s triat ed transverscly; apcrture large; operculum triangular; anterior valves with strong, transversc striro; posterior ~alves smooth, with greatly arcuatecl and sharp points. Fig . 2, 3, thc operculum. Found at Eyemouth, Frith of Porth, and at the moulh of thc Tay, adhering to muscles, stones, &c. 7. I3ALANUS PUNCT,\TUS, pi. LIII, f. 5, 6, 13, 20. Balam,s p1mctatus, First Ed., pi. 7, f. 5, 6, 13, 20; Mon- tagu, P· ~, pi. J, f. 5 ; Fleming, Edin. Ency., P· 101; Brown, Ency. 13rit., VI, p. 402. . Shell subconic, with inclistinct compartments; generally ,~•ith numerou$, lon" itnclinal, narrow ribs, and severa! transverse !mes of growth; ap~rturc wi<le, rather plain on thc ccl~e; operc,ulum somewhat cleprcsse<l, with numerous punctures, front rnl_ves linely striated transversely; posterior \'alves obtuse al the pomt, with the front marg ins dceply indentecl. Fi". 5, 6, t he operculum. o . 8. IlALANUS CRANCJIII, pi. LIII, f. 9, 10, 11, 12. B almms Ora11chii, First Ed., pi. 7, f . 9, 1 O, 11, 12; Lcach, Ency. Brit. Sup., Cirripedcs, pi. 57; Lepas Cra11cliii, Browu, Ency. Brit., VI, p. 403. Shell a depressed cone ; compartments indistinct ; sicles roun<lecl, smooth, with numerous, longitudinal, frequeutly in- terruptecl strim; basal margin cxtrcmely uneven; apcrture ,·cry small, somewhat pyriform, ancl smooth at the cd,,es • uperculum o ' very largc in proportion lo the size of the aperture; anterior valvcs with strong, transversc strire in front, ancl becoming arcuated posteriorly; when separatcd, their interna! margiu i~ found lo be strongly serratecl; posterior vahes slriated trans- versely, with greatly arcuated, sharp points; externa\ surface of a recldish-purple, tinged with pale yellowish-buff, ami wi1h from two to three transverse purple zones. Fig. 11, 12, the operculum. Common at Tenby, and other parts on the const of \Vales. 9. BALANUS CONOIDES, pi. LIV, f. 7. B alanus conoides, First Ed., pi. 6, f. 7 ; L epas cu11oides, Donovan, I, pi. 30, f. 3 ; Montagu, p. 12 ; Fleming, Ecliu. Ency., VII, p. 101; Maton and Rackett, p. 24. Shell conic; vah•es pointed at the apcx; compartments ob- scure, the thrce posterior ones larger thnn the others; whole surface longituclinnlly striated, and slightly so transverscly, pro- ducing a reticulatecl nppcarance, :md of a palc reclclish-pnrple colour; aperturc very small. Diamcler nt the base abont three-eighths of an inch. Found at \Veymouth, by Mr. Ilryer, attachecl to a specimcu of Pentelasmis la:vis. This is probably a foreign species. 10. BALANUS MoNTAGu1, pi. LIII, f. 24·, 25, 26• .Acasta llfontagtti, First Ecl., pi. 7, f. 2·1, 25, 2G; JJalmms spo11gcosus, Montagu, Sup., p. 2; Fleming, Edin. Ency., VIT, p. 101. Shell ováte; with six angulatcd compartments, their points exlencling consiclerably above the margin of thc apcrture ; threc anterior clivisions broader ancl not so long as tlw posterior oncs; externa\ surfacc wrinkled, and provicled with numerous, spiuiform processes; operculum four-valvccl; ante- rior pair with strong, regular, <lcep, but narrow ridges, crossecl by longitudinal strire, producing a decussated aspect, interna! margins det?ply serralcd; posterior pair larger thnn the others, and with considerably arcuated, sharp points; colour uf a livid or chocolate-brown. Length half an inch; breaclth somc- what less. Fig. 25, shell the natural sizc. Fig. 24, magniliecl. Fig. 26, the operculum. Founcl embeddcd in sponge, at Portland Rcach, by the late Mr. Bryer, of Weymouth. ¡ 1. IlAI,ANUS SPONGICOI,A, pi. LIII, f. 14, 15, 16. Balanus spo11gicola, First E<l., pi. 7, f. 6, 14, 15; Leacl1, MSS., p. l. Shell cylinclrical; with unec¡ual compartments, the _elev_ated Fig. 20, an elongatecl vanety. . Common on many of thc British and lrish_coasts, an'c~ is ~len- tiful on thc rocks between Kinghorn ª n <l Kirkcaldy, Fifcslnrc. 2H portion rising above the margin of the ap_erture, wluch 1s as wide as the base of thc shell; operculum with four valves; the anterior oncs with pretty strong, slightly oblique, transverse striro, and decussated by rnther slender, waved, longitudinal striro; posterior vah·es longitudinally striatecl, with consiclerably