180 UNIONIDJE. 



The following dimensions are taken from three specimens in 

 the Indian Museum : 



1. 2. 3. 



Long 44-5 35 34 mm. 



Lat 88 63 62 mm. 



Diam 28-25 20 20-25 mm. 



Subsp. consobrina (Led]. 



Unio consobrinus, Lea, Proc. Acad. Nat. Sci. Philadelphia, iii, 

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

 pi. 45, fig. 152 ; Obs. Genus Unio, vii, 1860, p. 90, pi. 45, tig. 152 ; 

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



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



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



in text. 



Lamellidens consobrinus (Lea), Simpson, Washington, D.C./ Smiths. 

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



Original description : Testa lasvi, elliptica, subinflata, insequi- 

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

 tenuibus, antice paulisper crassiusculis ; natibus prominulis ; 

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

 nalibus parvis, crenulatis, compressis, obliquis in valvulam dextram 

 duplicibus ; lateralibus longis, lamellatis subcurvisque ; margarita 

 salmonis colore tincta et valde iridescente. 



Nab. "China "(6'. M. WTieatley). 



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. Berlin, v, pt. 2, 1839, 

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

 p. 194, pi. 21, fiff. 49; Catlow & Eeeve, Conch. Norn. 1845, 

 p. 60 ; H. & A. Adams. Gen. Eec. 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 ; Pretel, Conch. Sam. iii, 1890, p. 126. 



Margarita (Unio} lamellatm, Lea, Syn. 1836, p. 26 ; 1838, p. 20. 



Margeron (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, I860, p. 61, pi. 36, fig. 122 ; 



