t^^l

lAMELLIDElS'S. 175
with two parallel, lamellar pseiidocardinals and one lateral ;
cavity of the beaks rather shallow ; dorsal scars few, deep,
distinct, scattered; anterior scars separate ; nacre bluish-white
to straw.
Animal unknown.
Subgenus LAMELLIDENS {sensu dricto).
Lamellidens, Simpson, Washington, D.O. Smiths. Inst., Nat. Mus.
Pi-oc. xxii, 1900, p. 854.
TYPE, Unio marginalts, Lamarck.
Eange. India ; Burma; Ceylon ; China.
Shell dark-coloured ; teeth well developed.
310. Lamellidens marginalis {Lamarck).
Lamellidens marginalis (Lamarck); Simpson, Washington, D.O.
Smiths. Inst., Nat. Mus. Proc. xxii, 1900, pp. 854-855; Die
hreite Mahler-Muschel mis Qrbnland, Sohroter, Flussconch. 1779,
p. 181,, pi. 9, %. 1.
? tfnio groenlandicus, Mcirch, Am. J. Conch, iv, 1868, p. 38.
? Unio testudinarius, Spengler, Skriv. Selsk. Nat. iii, 1793, p. Co ;
Pajtel, Concli. Sam. iii, 1890, p. 169.
? Umo truncatiis, Spennler, Skriv. Selsk. Nat. iii, 1793, p. 05 ;
PSchrtiter, Arch. Zool. Zoot. ii, 2 Stuok,_1803, p. 107.
Unio marginalis, Lamarck, An. sans Vert, vi, 1819, p. 79; Deshaves,
Enc. Meth. ii, 1827, p. 151, pi. 247, iig. 1; Hanley, Test. Moll.
1842, p. 206; Hanley, Blv. Shells, 1843, p. 206, pi. 20, iig. 53 ;
Catlow & Reeve, Conch. Nom. 1845, p. 61; H. & A. Adams,
Gen. Kec. Moll, ii, 1857, p. 491; Kiister, Conch. Cab., Unio,
1861, p. 239, pi. 80, fig. 4; Sowerby, Conch. Icon, xvi, 1867,
pL 59, tig. 27; H. & T., C. 1. 1876, p. 20, pi. 43, fig. 2 ; Psetel,
Conch. Sam. iii, 1890, p. 158.
Margarita (Unio) margiruilis, Lea, Syn. 1836, p. 37 ; 1888, p. 24.
Margaron ( Unio) marginalis. Lea, Syn. 1852, p. 38; 1838, p. 24.
Unio anodontina, Lamarck, An. sans Vert, vi, 1819, p. 80 ;
Deshayes, An. sans Vert, vi, 1835, p. 646 ; ii, 1839, p. 671.
Unio anodontimts, Kiister, Conch. Cab., Unio, 18(51, p. 240, pi. 80,
fig. 15; Pietel, Conch. Sam. iii, 1890, p. 144.
Symphanota bilineuta, Lea, Philadelphia, Pa., Trans. Amer. Phil.
Sec. iv, 1831, p. 98, pi. 11, fig. 19 ; Obs. Genus Unio, i, 1884,
p. 108, pi. 11, fig. 19.
Margarita {Unio) hilineatus. Lea, Syn. 1836, p. 38; 1838, p. 25.
Unio hilineatus, Hanley, Test. Moll. 1842, p. 207 : Biv. Shells,
1843, p. 207, pi. 21, fig. 30; Catlow & Reeve, Conch. Nom.
1845, p. 56 ; H. & A. Adams, Gen. Rec. Moll, ii, 1857, p. 491;
Sowerby, Conch. Icon, xvi, 1868, pi. 71, fig, 865.
Margaron (Unio) bilineatus, Lea, Syn. 1852, p. 88 ; 1870, p. 61.
? Unio evanesceiis, Mousson, Moll. Java, 1849, p. 91, pi. 17, fig. 2.
Original description :—-Testa ovato-oblonga, subrhombea, tenui,
intufe cserulescente ; fasciis transversis marginalibus ; dente cardinali
parvo compresso.