APPENDIX. 



Mihii><'. in Essai stir la Fauna Mai. de Belgique, 1869, gives the following as new species, wbicb I con- 

 sider as doubtful : 



1'iiio Lambottei. 

 " Ryckholtii. 

 " Hobianoi. 



Genliluomo, in Bull. Mala. Ital., Pisa, vol. i.: 

 Unio Lawleyianus. 



Mb'rch, in Am. Jl. Conch., vol. v. p.'38, informs us that Unio Grcenlandicus, Schrb't., is tbe same as testu- 

 dinarius, Speng. (marginalis, Lam.) from Tranquebar. 



Villa. A letter of March 10, 1870, from Sig. Yilla, Milan, asks my decision on a Unio Danelli described 

 by him, from Melbourne, Australia, but I have not had the advantage of seeing the shell, nor of 

 receiving the description which he sent to me. 



Wiegmann. Mollusca. Arch, fur Nat., 1835, vol. i. p. 317. 



Troschel. Neue Siissw. Conch, aus dem Ganges. Arch, fur Nat., 1837, vol. i. p. 166. 



Von Martens. TJeber Siidbrasilische Land- und Siissw. Moll., Mai. Bliitt., 1868, came too late to insert 

 the species in the Sj'uonymy of the Synopsis. 



Ludwig. Unio Munzenbergensis. Palseontologia, vol. viii. 



Sowerby, in Conch. Icon., pts. 278, 279, 280, 281: 



Hyria exasperata . . . . = corrugata, Lam. 



" latialata = " " 



" rugosissiraa . . . = " " 



" recta = subviridis, Klein. 



" alata = " " 



Castalia Schombergiaiia = Prisodon truncatus, Schum. 



" ovata = " " " 



" Hanleyana . . . = " " " 



" Carolinensis* . = " 



" quadrata . . . . = " " " 



" dollabella . . . = Duprei, Recluz. 

 Anodonta biangulata . . = angulata, Lea. 



* The habitat given is South Carolina. No species of this genus has been observed in North America 



