842 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



" Margaroii {Unto) luteus Lea, Syn., 1870, j). 46. 



* ? Unio semirugatus Chenu, Til. Couch., 1858, pi. xii, figs. 2, 2a. 



*Unio merodahensis Kuster, Conch. Cab. Unio, 1861, p. 233, pi. Lxxviii, fig. 1. — 

 "Blanford, J. As. Soc. Beng., XXXV, 1866, p. 142.— "^ P.^tel, Conch. Sam., 

 Ill, 1890, p. 159. 



*Cmjo wijiieg^ingcensis Hanley and Theobald, i Conch. IncL, 1876, p. 21, pi. xlv, 

 fig. 6. 



* Unio tennenti Hanley and Theobald, Conch. Ind., 1876, p. 22, pi. xlv, figs. 7-9. — 



*P.ETEL, Conch. Sam., Ill, 1890, p. 169. 

 ^Unio phaijresi Theobald, manuscript. 



PARREYSIA CORRUGATA var. L.<EVIROSTRIS Benson. 



^Unio Icerirostris Bensox, Ann. and Mag., 1862, p. 192; * Jl. As. Soc. Beng., 1862, 



XXXV, p. 144.— "-P.ETEL, Conch. Sam., Ill, 1890, p. 157. 

 "* Unto corrugatus A^ar. Icevirostris Hanley and Theobald, Conch. Ind., 1876, p. 21, 



pi. XLiv, figs. 5, 6. — * P.ETEL, Conch. Sam., Ill, 1890, p. 149. 



t PARREYSIA CORRUGATA var. NAGPOORENSIS Lea. 



*Unio nagpoorensis Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 331; * Jl. Ac. N. Sci. 



Phila., IV, 1860, p. 270, pL xlv, fig. 150; *Obs., VII, 1860, p. 88, pi. xlv, fig. 



150.—^^ Blanford, Jl. As. Soc. Beng., XXXV, 1866, p. 143. 

 ^Margaroii ( Unio) nagpoorensis Lea, Syn., 1870, p. 38. 

 ^ Unio corrugatus Miill. var. nagpoorensis Hanley and Theobald, Couch. Ind,, 



1876, p. 21.— PiETEL, Conch. Sam., 1890, p. 149. 



India; Burma.? 



t PARREYSIA WYNEGUNG.ENSIS Lea. 



"^ Unio wi/negnngcBnels Lea,^ Pr. Ac. N. Sci. Phila., Ill, 1859, p. 331; *J1. Ac. N. 

 Sci. Phila., IV, 1860, p. 271. pi. xlv, fig. 151 ; *Obs., VII, 1860, p. 89, pi. xlv, 

 fig. 151.— '' Blanford, Jl. As. Soc. Beng., XXXV, 1866, p. 143.— *Sowerby, 

 Conch. Icon., XVI, 1868, pi. Lxvii, p. 339.— *P^tel, Conch. Sam., Ill, 1890, 

 p. 172. 



"* Margaron (Unio) wijnegungwnsis Lea, Syn., 1870, p. 50. 



Wynegunga Eiver, Bengal. 



t PARREYSIA FAVIDENS Benson. 



*? Mya spuria Wood, Ind. Test., 1825, p. 12, pi. ii, fig. 35ffl. 



*Unio favidens Benson,'' Ann. and Mag., X, 1862, p. 188; *J1. As. Soc. Beng., 

 XXXV, 1867, p. 138.— * Hanley and Theobald, Conch. Ind., 1876, p. 6, 

 pi. XI, fig. 1. — *Eeevb, Conch. Icon., XVI, 1865, pl.xxvi, fig. 131. — *P/etel, 

 Couch. Sam., Ill, 1890, p. 152. 



*Margaron (Unio) favidens Lea, Syn., 1870, p. 38. 



* Unio flavidens PiETEL, Couch. Sam., Ill, 1890, p. 152. 



""Unio triroatris Musgrave, Hanley Phot. Conch., 1863, pi. ii, fig. 9. — * Hanley 

 and Theobald, ^ Conch. Ind., 1876, p. 6, pi. xi, fig. 6.— * P.etel, Conch. 

 Sam., Ill, 1890, p. 170. 



'I think this is corrugatus and not the wynegungcvnsis of Lea. 



2 Heavier, more elongated .and pointed behind than corrugata, yet probably only 

 a variety of it. 



3 Several varieties, marcens, trigona, delta',, chrysis, viridula, and densa are given by 

 Benson, which hardly seem to me to be worth mentioning. 



■'This:^ U. tripartitus of Lea, with a darker epidermis and a more pronounced 

 basal swelling. There is every variation in the coloring and swelling. 



