LAMELLLDENS. 



with 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.C. Smiths. Inst., Nat. Mus. 

 Proc. xxii, 1900, p. 854. 



TYPE, Unio marginalia, Lamarck. 

 Eange. India ; Burma ; Ceylon ; China. 

 Shell dark-coloured ; teeth well developed. 



310. Lamellidens marginalis (Lamarck). 



Lamellidens marginalis (Lamarck) ; Simpson, Washington, D.C. 



Smiths. lust., Nat. Mus. Proc. xxii, 1900, pp. 854-855; Die 



breite Mahler-Mtischel aus Gronland, Schroter, Flussconch. 1779 



p. 181, pi. 9, fig. 1. 



? Unio groenlandicus, Morch, Am. J. Conch, iv, 1868, p. 38. 

 ? Unio testudinarius, Spengler, Skriv. Selsk. Nat. Hi, 1793, p. 65 ; 



P*etel, Conch. Sam. iii, 1890, p. 169. 

 ? Umo truncatus, Spengler, Skriy. Selsk. Nat. iii, 1793, p. 65 ; 



? Schroter, Arch. Zool. Zoot. ii, 2 Stuck, 1802, p. 107. 

 Unio marginalis, Lamarck, An. sans Vert, vi, 1819, p. 79 ; Deshave.*, 



Enc. Meth. ii, 1827, p. 151, pi. 247, fig. 1 ; Hanley, Test. Moll. 



1842, p. 206 ; Hanley, Biv. Shells, 1843, p. 206, pi. 20, fig. 53 ; 

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

 Gen. Rec. Moll, ii, 1857, p. 491 ; Kiister, Conch. Cab., Umo, 

 1861, p. 239, pi. 80, fig. 4; Sowerby, Conch. Icon, xvi, 1867, 

 pi. 59, tig. 27 ; H. & T., C. I. 1876, p. 20, pi. 43, fig. 2 ; Paetel, 

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



Margarita ( Unio) marginalis, Lea, Syn. 1836, p. 37 ; 1838, 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. 546 ; ii, 1839, p. 671. 

 Unio anodontinus, Kiister, Conch. Cab., Unio, 1861, p. 240, pi. 80, 



tig. 15 ; Pjetel, Conch. Sam. iii, 1890, p. 144. 

 Symphanota bilineata, Lea, Philadelphia, Pa., Trans. Amer. Phil. 



Soc. iv, 1831, p. 98, pi. 11, fig. 19; Obs. Genus Unio, i, 1834, 



p. 108, pi. 11, fig. 19. 



Margarita ( Unio} bilineatus, Lea, Syn. 1836, p. 38 ; 1838, p. 25. 

 Unio bilineatus, Hanley, Test. Moll. 1842, p. 207 ; Biv. Shells, 



1843, p. 207, pi. 21, fig. 30; Catlow & Reeve, Conch. Norn. 

 1845, p. 56 ; H. & A. Adams, Gen. Rec. Moll, ii, 1857, p. 491 ; 

 Sowerby, Conch. Icon, xvi, 1868, pi. 71, fig. 365. 



Margaron ( Unio) bilineatus, Lea, Syn. 1852, p. 38 ; 1870, p. 61. 

 ? Unio evanescens, Mousson, Moll. Java, 1849, p. 91, pi. 17, fig. 2. 



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

 intus caerulescente ; fasciis transversis marginalibus ; dente cardi- 

 nali parvo conipresso. 



