uisrio. 



45 



Unio orientalis. Bourg. 

 *regularis. Lea. Chenu. 

 *Paraguayensis. Lea. 



Swinlioei. H. Adams. Reeve. 

 *amceiLus. Lea. Chenu. 

 *Sapotalensis. Lea. Chenu. 

 *Oregonensis. Lea. 

 *Medelliiiiis.^ Lea. Chenu. Ban. 

 *notatus. Lea. Chenu. Han. 

 *inicans. Lea. 

 *perlucens. Lea. 

 *sul)angialatiis. Lea. 

 *sparus. Lea. 

 *Yeracruzensis. Lea. 

 *scitulus. Lea. 

 ^Goascoranensis. Lea. 

 *gracilior. Lea. 

 *o'bfuscus. Lea. 

 *rutilans. Lea. 

 *siibellipsis. Lea. 

 *datus. Led. 



OVAL. 



Aucklandicus. Gray. 

 *dispar. Lea. 

 *cGiicestator. Lea. . . ' _ 

 *lienosus.'' Con. iLust. Han. 

 *calliginosus. Lea. - 

 *firmus. Lea. 



*]Sraslivinensis.^ Lea. Han. 

 *contigxius. Lea. 

 *umbrans. Lea. 

 *intercedens. Lea. 

 *fallax. Lea. 

 *obscurus. Lea. 

 *genuinus. Lea. 



*Ziegierianus. Lea. Chenu. Han. 

 *proximus. Lea. 

 *nitens. Lea. 

 *Copei. Lea. 

 *Pybasii. Lea. 

 *proprms. Lea. 

 *tenebricus. Lea. 

 *Prattii. Lea. 



^ Mr. Say's purpuriatus and this may be the same. I have aever seen his specimens, and there is no 

 figure. The description is in the Disseminator., Jan. 1, 1831. 



'^ Mr. Conrad, in his 3Ionograph of Unionidas, p. 61, considers Nashvillensis, Lea, to be the same 

 with lienosus, Con.; but tlie former shell is certainly not the species figured 'hj him pi. 34, f. 2. 

 12 



