LAMELLIBEXS. 



175 



uitli two parallel, lamellar pseudocardinals 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 stricto). 



Lamellidens, Simpson, Washington, D.U. Smiths. lust., Nat. Mus. 

 Proc. xxii, 1900, p. 8o4. 



Type, Unio manjinalis, Lamarck. 



2ianc/e. India ; Burma ; Ceylon ; China. 

 Shell dark-coloured : teeth well developed. 



310. Lamellidens marginalis {Lamarck). 



Lamellidens maryinalis (Lamarck) ; Simpson, Wasliingtou, B.C. 



Smiths. Inst., Nat. Mus. I'roc. xxii, 1900, pp. 854-855; Die 



hreite Mahler-Muschel aii>^ Gronland, Schroter, Flussconch. 1779, 



p. 18l,pl.9, fio-. 1. 

 ? Unio </roe>iIaudiciis, Miircli, Am. J. Conch, iv, 18G8, ]). 38. 

 ? Unio testudinarius, Spengler, Skriv. Selslc. Nat. iii, 1793, p. (;."J ; 



Pjetel. Conch. Sam. iii. 1890, p. 169. 

 ? Umo tnmcatKS, Spenf;ler, Slvriv. Selsk. Nat. iii, 1793, p. 05 ; 



? Schroter, Arch. Zool. Zoot. ii, 2 Stiick, 1S02, p. 107. 

 Unio marf/imdis, Lamarck, An. sans Vert, vi, L^19, p. 79 ; Deshave.*, 



Enc. Meth. ii, 1827, p. 151, pi. 247, tig. 1 ; Ilaulev, Test. M.ill. 



1842, p. 206; Ilanley, Biv. Shells, 1843, p. 206, pL 20, tig. 53 ; 

 Catlow & Reeve, Conch. Nom. 1845. p. 61 ; H. & A. Adams, 

 Gen. Kee. Moll, ii, 1857, p. 491 ; Kiister. Conch. Cab., Unio, 

 1861. p. 239, ])1. 80. fig. 4; Sowerby, Couch. Icon, xvi, 1867, 

 pk 59, tig. 27; H. & T., C. 1. 1876. p." 20, pk 43, tig. 2 ; Paetel, 

 Conch. Sam. iii, 1890, p. 158. 



Margarita {Unio) marginalis, Lea, Syn. 1836, p. 37 ; 1838, p. 24. 

 Marijaron {Unio) marginalis, Lea, Syn. 1852, p. 38; 1S38, p. 24. 

 Unio anodontina, Lamarck, An. sans Vert, vi, 1819, p. 80 ; 



Deshayes, An. sans Vert, vi, 1835, p. 546 ; ii, 1839, p. 671. 

 Uiiio anodontinm, Kiister, Conch. Cab., Unio. k^61, p. 240, pk 80, 



tig. 15 ; P£etel, Conch. Sam. iii, 1S90, p. 144. 

 Symphanota hilineata, Lea, I'hiladelphia, Pa., Trans. Amer. Pliil. 



See. iv, 1831, p. 98, pi. 11, tig. 19; Obs. (tbuus Unio, i, 1834, 



p. 108, pk 11. fig. 19. 

 Margarita (Unio) hilineatus, Lea, Syn. 1836, p. 38; 1838, p. 25. 

 U7iiu biIi7U'at!ts. Ilanlev, Test. Moll. 1842. p. 207 : Biv. Shells, 



1843, p. 207, pk 21.' fig. 30; Catlow & Reeve, Conch. Nom. 

 1845, p. 5(5 ; II. .S: A. Adams, Gen. Rec. Moll, ii, 1857, p. 491 ; 

 Sowerby, (^nch. Icon, xvi, 1868, pk 71, fig. 305. 



Margaron {Unio) bilineatus, Lea, Syu. 1852, p. 38; 1870, p. 61. 

 P Unio evanescens, Mousson, Moll. Java, 1849, p. 91, pk 17, fig. 2. 



Original description : — Testa ovato-oblonga, subrhombea, tenui, 

 intus ca?rulescente ; fasciis trans versis marginalibus ; dente cardi- 

 nal! ])arvo compresso. 



