856 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tLAMELLIDENS PULCHER Tapperone-Canefri. 

 * Unio piilclier Tapperone-Canefki, Ann. Mus. Civ., VII, 1889, p. 350.' 

 Houngdaran, Burma. 



LAMELLIDENS EXANTHEMATICUS Kuster. 



* Unio exanthematicus Kuster, Coiicli. Cab. Unio, 1861, p. 243, pi. lxxxi, fig. 2. — 



* P^TEL, Couch. Sam., Ill, 1890, p. 152. 



East Indies, 



tLAMELLIDENS THWAITESII Lea. 



Unio ilnmiiesii Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 152; *^ Jl. Ac. N. Sci. Phila., 

 IV, 1860, p. 246, pi. XXXVII, fig. 125; * Obs., VII, 1860, p. 64, pi. xxxvii, fig. 

 125. — *Eeeve, Conch. Icon., XVI, 1865, pi. xxiii, fig. 105.— *Hanley and 

 Theobald, Conch, Inch, 1876, p. 20, pi. xliii, -fig. 1.~*P.etel, Conch. Sam., 

 Ill, 1890, p. 169. 



* Margaron ( Unio) ihwaitesii Lea, Syn., 1870, p. 41. 



'" Unio consoirinus Hanley and Theobald, Conch. Ind., 1876, p. 19, pi, xli, fig. 7. 



Ceylon, 



tLAMELLIDENS CONSOBRINUS Lea. 



^Un'to Gonsohrinm Lea,- Pr. Ac. N. Sci. Phila., Ill, 1859, p. 331; *J1. Ac. N. Sci. 



Phila., 1860, p. 272, pi. xlv, fig. 152 ; * Obs., VII, 1860, p. 90, pi, xlv, fig. 152,— 



' P.ETEL, Couch. Sam., Ill, 1890, p. 148. 

 ^ Margaron ( Unio) eonsobrinits Lea, Syn., 1870, p. 46. 



* Unio corheti Deschamps, Bull. Soc. Zool. Fr., XVII, 1892, p. 68, fig.s 



China; India; Ceylon, 



tLAMELLIDENS LAMELLATUS Lea. 



*Z7«io lamellatus Lea, Tr. Am. Phil. Soc, VI, 1838, p. 19, pi. vi, fig. 16; *0b8., II, 

 1838, p. 19, pi. VI, fig. 16.— -^Troschel, Arch. fiir. Nat., V, 1839, Pt. 2, p. 234.— 

 ^Hanley, Test. Moll., 1842, p. 194; Biv. Shells, 1843, p. 194, pi. xxi, fig. 49.— 

 ^CATLOwaud Rekve, Conch. Nora., 1845, p. 60. — *H. and A. Adams, Gen. 

 Eec. Moll., II, 1857, p. 494.— *Chexu, 111. Conch., 1858, pi. xxii, figs. 3, 3a, 

 35.— '* SOWERBY, Conch. Icon., XVI, 1866, pi. Lii, fig. 272. — ^Hanley and 

 Theobald, Conch. Ind., 1876, p. 21, pi. xliv, fig. 7.— ''P.etel, Conch. Sam., 



III, 1890, p. 126. 



"Margarita ( Uiiio) lamellatus Lea, Syn., 1836, p. 26; 1838, p. 20. 

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



* t Unio layardii Lea, Pr. Ac, N. Sci. Phila., Ill, 1859, p. 153; ^ Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 243, pi. xxxvi, fig. 122; ^Obs., VII, 1860, p. 61, pi. xxxvi, fig. 122.— 



* Reeve, Couch. Icon., XVI, 1865, pi. xxiii, fig. 111.—" Hanley and Theo- 

 bald, Conch. Ind., 1876, p. 19, pi. xli, fig. 1. — * P^etel, Conch. Sam., Ill, 

 1890, p. 157. 



^Margaron {Unio) layardii Lea, Syn., 1870, p. 46. 



India; Ceylon. 



^ Only a Latin description is given. We have two shells in the U. S. National 

 Museum from the type lot, and it is, perhaps, a valid species, close to marginalis. 



2 Possibly only a variety of thwaitesii. 



^ Unio mainwaringil^ evill. Shells have been several times received bearing this 

 name, which seem to me to be only consohrinus. I can not find that Nevill ever 

 described the species. 



