AND OTHER FAMILIES. 



201 



Unio earimfera is also the complanatiis, which inhabits so large a 

 space of our country east and west of the Alleghany mountains. 



Unio Georgina is also from the mine complanatus. 



Unio clava. This is the scaknia of Rafinesque : mocUoliformis of 

 Say. 



Unio recta is Barnes's prxlongus, Lamarck has precedence. 



Unio naviformis. This is the cylindricus of Say, who has prece- 

 dence. 



Unio glabrata. This is the complanatus. The specimen in the 

 Duke de Rivoli's cabinet is most likely from our eastern waters. 



Unio nasuta. The specimen from which this description was made, 

 is now in the museum of the Garden of Plants. It is a young gibbosus 

 of Barnes. It is not the same with Say's nasiitus, as Lamarck sus- 

 pected it to be. As Lamarck described the shell before Barnes, he 

 has a claim for the species ; but having used a name pre-occupied by 

 another shell, he loses it. I therefore would continue Mr Barnes's 

 name gibbosus. 



Unio ovata is the ovatus of Say. Var. b, I was not enabled to see 

 — from the description I presume it to be a variety of occidens (nobis). 



Unio rotundata. The specimen shown to me by Baron de Ferussac, 

 whose cabinet is cited for one of the two specimens seen by Lamarck, 

 is a small suborbiculata (Lam.), a large specimen of which the baron 

 had the goodness to give me, and I have reason to believe it to be the 

 individual cited by Lamarck. It is. the subglohosus (nobis), and the 

 glebuliis of Say. 



Unio littoralis. This interesting species inhabits most parts of Eu- 

 rope. It has been brought also from the Tigris by some of the French 

 scientific expeditions, and I owe to the kindness of the administration 

 of the Garden of Plants a fine specimen from Bagdad. The specimens 

 from this locality are less transverse, and Lamarck considered the dif- 

 ference sufficient to found a species, semirngata, by which name they 

 are labelled in that institution. After examining carefully suites from 

 Europe and Asia with Baron de Ferussac, he accorded with me in 

 opinion, that there was not sufficient difference to warrant their sepa- 

 ration. 



53 



.^5»^ 



