180 UNIONID.E. 



The following dimensions are taken from three specimens in 

 the Indian Museum : — 



1. 



Long 44"5 



Lat 88 



Diam 28-25 



Subsp. consobrina {Lea). 



TJnio consobriniis, Lea, Proc. Acad. Nat. Sci. Philadelphia, iii, 

 1859, p. 331 ; Journ. Acad. Nat. Sci. Philadelphia, 1860, p. 272, 

 pi. 45, fic^. 152 ; Obs. Genus Unio, vii, 1860, p. 90, pi. 45, tiy. 152 ; 

 Pajtel, Conch. Sam. iii, 1890, p. 148. 



Margaron ( Unio) cunsobriniis, Lea, Syn. 1870, p. 46. 



Unio corbeti, Deschamps, Bull. Soc. Zool. Fr. xvii, 1892, p. 68, fig. 

 in text. 



Lamellidens consohrinus (Lea), Simpson, Washington, D.C., Smiths. 

 Inst., Nat. Mus. Proc. xxii, 1900, p. 856. 



Onginal description : — Testa Isevi, elliptica, subinflata, insequi- 

 laterali, postice obtuse angulata, autice rotundato ; valvulis sub- 

 tenuibus, antice paulisper crassiusculis ; natibus prominulis ; 

 epidermide micante, tenebroso-fusca, eradiata ; dentibus cardi- 

 nalibus parvis, ci'enulatis, compressis, obliquis in valvulam dextram 

 duplicibus ; Lateralibus lougis, lamellatis subcurvisque ; margarita 

 salmonis colore tincta et valde iridescente. 



Hah. "China" (6'. J/. Wheatle>/). 



The locality as given by Lea is probably a mistake ; the variety 

 is widely distributed over India and Ceylon. 



The following are the dimensions of three specimens in the 

 Indian Museum collection : — 



1. 2. 3. 



Long 43 48-5 47 mm, 



Lat 79 91 ^ 83 mm. 



Diam 27'5 32 27 mm. 



Subsp. lamellata (Lea). 



Unio lamellatus, Lea, Philadelphia, Pa., Trans. Amer. Phil. Soc. 

 vi, 1838, p. 19, pi. 6, fig. 16 ; Obs. Genus Unio, ii, 1838, p. 19, 

 pi. 6, fig. 16 ; Troschel, Arch. Natg. Berhn, v, pt. 2, 1839, 

 p. 234; Hanley, Test. Moll. 1842, p. 194 ; Biv. Shells, 1843, 

 p. 194, pi. 21, fig. 49; Catlow & Reeve, Couch. Nom. 1845, 

 p. 60 ; 11. & A. Adams. Gen. Rec. Moll, ii, 1857, p. 494 ; Chenu, 

 111. Conch. 1858, pi. 22, figs. 3, 3 a, 3 b ; Sowerby, Conch. Icon, 

 xvi, 1866, pi. 52, fig. 272; H. & T., C. I. 1876, p. 21, pi. 44, 

 fig. 7 ; Ptetel, Conch. Sam. iii, 1890, p. 126. 



Margarita {Unio) lamellatus, Lea, Syn. 1836, p. 26 ; 1838, p. 20. 



Mavgeron (Unio) lamellatus, Lea, Syn. 1852, p. 29; 1870, p. 46. 



Unio layardi, Lea, Proc. Acad. Nat. Sci. Philadelphia, iii, 1859, 

 p. 153 ; Journ. Acad. Nat. Sci. Philadelphia, iv, 1860, p. 243, 

 pi. 36, fig. 122 ; Obs. Genus Unio, vii, 1860, p. 61, pi. 36, fig. 122 ; 



