PAEKETSIA. 155 



Unio corrugata, Lamarck, An. sans Vert, vi, 1819, p. 78 ; Deshayes, 



Enc. Meth. ii, 1827, p. 584, pi. 248, fig. 8. 

 Unio (Potamida) corrugata, Swainson, Tr. on Mai. 1840, p. 268, 



fig. 51 ; p. 281, fig. 57. 

 Unio corrugata, Retzius, Diss. Hist. Nat. 1778, p. 18; Speugler, 



Skriv. Selsk. Nat. iii, 1793, p. 68 ; Hanley, Test. Moll. 1842, 



p. 197 ; Biv. Shells, 1843, p. 197 ; Catlow & Reeve, Conch. 



Nona. 1845, p. 57 ; H. & A. Adams, Gen. Rec. Moll, ii, 1857, 



pp. 493, 497 ; Kiister, Conch. Cab., Unio, 1862, p. 289, pi. 97, 



figs. 3, 4 : Blanford, J. A. S. B. xxxv, 1867, p. 136 ; Sowerby, 



Conch. Icon, xvi, 1868, pi. 71, fig. 360; H. & T., C. I. 1876, 



p. 21, pi. 45, figs. 2-5 ; Pa>tel, Conch. Sam, iii, 1890, p. 149. 

 Margarita ( Unio) corrugatus, Lea, Syn. 1836, p. 29 ; 1838, p. 21. 

 Margaron ( Unio) corrugatus, Lea, Syn. 1852, p. 20 ; 1870, p. 30. 

 Mya spuria, Gmelin, Syst. Nat, 13th ed. 1788, p. 3222; Wood, 



Gen. Conch, i, 1815, p. 110; Lamarck, An. sans Vert, vi, 1819, 



p. 80. 



Mya gaditana, Schreiber's Versuch. 1793. 

 Unio multidentatus, Philippi, Conch, iii, 1847, p. 46, pi. 3, fig. 4 ; 



Kiister, Conch. Cab., Unio, 1856, p. 136, pi. '36, fig. 5; Psetel, 



Conch. Sam. iii, 1890, p. 160. 



Margaron ( Unio) multidentatm, Lea, Syn. 1870, p. 50. 

 Unio fulmineus, Philippi, Conch, iii, 1847, p. 46, pi. 3, figs. 5, 6 ; 



Kiister, Conch. Cab., Unio, 1862, p. 286, pi. 96, figs. 2, 3 ; Psetel, 



Conch. Sam. iii, 1890, p. 153. 

 Unio lutens, Lea, Proc. Acad. Nat. Sci. Philadelphia, viii, 1856, 



p. 93; Journ. Acad. Nat. Sci. Philadelphia, iii, 1857, p. 291, 



pi. 24, fig. 4 ; Obs. Genus Unio, vi, 1857, p. 11, pi. 24, fig. 4. 

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

 ? Unio semirugatus, Chenu, Conch, iii, 1858, pi. 12, figs. 2, 2 a. 

 Unio merodabensis, Kiister, Conch-Cab., Unio. 1861, p. 233, pi. 78, 



fig. 4; Blanford, J. A. S. B. xxxv, 1866, p. 142; Psetel, Conch. 



Sam. iii, 1890, p. 159. 



Unio ivynegungaensis, II. & T., C. I. 1876, p. 21, pi. 45, fig.6. 

 Unio tennenti, II. & T., C. I. 1876, p. 22, pi. 45, figs. 7 & 9; Psetel, 



Conch. Sam. iii, 1890, p. 169. 

 Unio phayresi, Theobald MSS. 



Original description. Testa viridescens, tenera, pellucida, ab 

 utraque cardinis parte et in natibus striis elevaiis rugosis, figuraque 

 a prsBcedente distincta. Valvulse intus striis radiantibus, sub- 

 tilissimus notantur. Csetera uti in praecedente. Epidermide 

 remota margaritacea evadit. 



Hob. Rivers of Coromandel. 



The species has a wide range and is represented in the Indian 

 Museum Collection by a long series of specimens, definite localities 

 for which are as follows: Garchiroti Tabsil: River Dukkaree 

 near Uniballa ; Ceylon ; Sewan, close to the Indus ; Gudur, 

 Madras Presidency; Manbhoom; Patna; Berhampore; Murshi- 

 dabad District; Brahmapuri Tahsil; Bangalore; Phenchooganj, 

 Sylhet ; Singpai Garki, Nepal ; Arrah. Assam. 



As the original description is short and somewhat inadequate, 

 the following taken from the ' Conchologia Iconica ' may be of 

 interest : Testa parva, viridi, subventricosa, magis minusve ovali, 

 vix inaequilaterali, laevigata, paucis autem linearibus obliquis nates 



