The arrangement here adopted is a modified Lamarckian one, very similar to that used by Reeve and Sowerby, and by Mr. HANLEY, in his _Illustrated Catalogue of Recent Shells_.[1] [Footnote 1: Below will be found a general reference to the Works or Papers in which are given descriptive notices of the shells contained in the following list; the names of the authors (in full or abbreviated) being, as usual, annexed to each species. ADAMS, _Proceed. Zool. Soc._ 1853, 54, 56; _Thesaur. Conch._ ALBERS, _Zeitsch. Malakoz._ 1853. ANTON, _Wiegm. Arch. Nat._ 1837; _Verzeichn. Conch_. BECK in _Pfeiffer, Symbol. Helic._ BENSON, _Ann. Nat. Hist._ vii. 1851; xii. 1853, xviii, 1856. BLAINVILLE, _Dict. Sc. Nat.; Nouv. Ann. Mus. His. Nat._ i. BOLTEN, _Mus._ BORN, _Test. Mus. Cæcs. Vind._ BRODERIP, _Zool. Journ._ i. iii. BRUGUIERE, _Encyc. Méthod. Vers._ CARPENTER, _Proc. Zool. Soc._ 1856. CHEMNITZ, _Conch. Cab._ CHENU, _Illus. Conch._ DESHAYES. _Encyc. Méth. Vers.; Mag. Zool. 1831; Voy. Belanger; Edit. Lam. An. s. Vert.; Proceed. Zool. Soc._ 1853, 54, 55. DILLWYN. _Deser. Cat. Shells._ DOHRN, _Proc. Zool. Soc._ 1857, 58; _Malak. Blätter; Land and Fluviatile Shells of Ceylon._ DUCLOS, _Monog. of Oliva._ FABRICIUS, _in Pfeiffer Monog. Helic.; in Dohrn's MSS._ FÉRUSSAC, _Hist. Mollusques._ FORSKAL, _Anim. Orient._ GMELIN, _Syst. Nat._ GRAY, _Proc. Zool. Soc._ 1834, 52; _Index Testaceologicus Suppl.; Spicilegia Zool.; Zool. Journ._ i.; _Zool. Beechey Voy._ GRATELOUP, _Act. Linn. Bordeaux,_ xi. GUERIN, _Rev. Zool._ 1847. HANLEY, _Thesaur. Conch,_ i.; _Recent Bivalves; Proc. Zool. Soc._ 1858. HINDS, _Zool. Voy. Sulphur; Proc. Zool. Soc._ HUTTON, _Journ. As. Soc._ KARSTEN, _Mus. Lesk._ KIENER, _Coquilles Vivantes._ KRAUSS, _Sud-Afrik Mollusk._ LAMARCK, _An. sans Vertéb._ LAYARD, _Proc. Zool. Soc._ 1854. LEA, _Proceed. Zool. Soc._ 1850. LINNÆUS, _Syst. Nat._ MARTINI, _Conch. Cab._ MAWE. _Introd. Linn. Conch.; Index Test. Suppl._ MEUSCHEN, in _Gronor. Zoophylac._ MENKE, _Synop. Mollus._ MULLER, _Hist. Verm. Terrest._ PETIT, _Pro. Zool. Soc._ 1842. PFEIFFER, _Monog. Helic.: Monog. Pneumon.; Proceed. Zool. Soc._ 1852, 53, 54, 55. 56; _Zeitschr. Malacoz._ 1853. PHILIPPI, _Zeitsch. Mal._ 1846, 47: _Abbild. Neuer Conch._ POTIEZ et MICHAUD. _Galeric Douai._ RANG, _Mag. Zool._ ser. i. p. 100. RÉCLUZ, _Proceed. Zool. Soc._ 1845; _Revue Zool. Cur._ 1841: _Mag. Conch._ REEVE, _Conch. Icon.; Proc. Zool. Soc_: 1842, 52. SCHUMACHER. _Syst._ SHUTTLEWORTH. SOLANDER. in _Dillwyn's Desc. Cat. Shells;_ SOWERBY, _Genera Shells; Species Conch.; Conch. Misc.; Thesaur. Conch.; Conch. Illus.; Proc. Zool. Soc.; App. to Tankerrille Cat._ SPENGLER, _Skrivt. Nat. Selsk. Kiobenhav._ 1792. SWAINSON, _Zool. Illust._ ser. ii. TEMPLETON, _Ann. Nat. Hist._ 1858. TROSCHEL, in _Pfeiffer, Mon. Pneum; Zeitschr. Malak._ 1847; _Wiegm. Arch. Nat._ 1837. WOOD, _General Conch_.] Aspergillum Javanum. _Brug._ Enc. Mét. sparsum, _Sowerby_, Gen. Shells.[1] clavatum, _Chenu,_ lllust. Conch.