i) ° RAFINESQUE’S 
my travels of 1818 and 1819, and figured 28 of them. This labour 
was written at Lexington, in January 1820, and published in French, 
at Brussels, in September 1820, in the General Annals of Physical 
Sciences, by Bory and Drapiez, and also in a separate pamphlet. I 
stated then, that several other species existed in the Western Waters, 
but described none but those I had before my eyes. I have, how- 
ever, diligently collected these additional species, in my successive 
travels between 1820 and 1826, and have thus added, at least 40 
species to the 75 already described ; some of which, must also form 
peculiar Genera, or Sub-genera, particularly the Lasmonos, which 
fills the gap in the variety of hinges. We have thus five different 
tribes of Bivalve shells. 
1. Unio. Hinge, with a cardinal tooth and a lamellar tooth. 
. Alasmodon. Hinge, with a cardinal tooth only. 
. Lasmonos. Hinge, with a lamellar tooth only. 
. Anodonta. Hinge, without teeth. 
. Cyclas. Hinge, with two lamellar teeth. 
My labor on this branch of conchology, of which I was the pioneer 
and first historian, has attracted a great deal of attention in Europe, 
and latterly, also, with us. -I was repeatedly asked for the shells I 
had diseovered and described ; I disposed of some rare ones, for the 
Museum of my friend Clifford, in Lexington, and for the Museum of 
Transylvania University. I furnished several to my friends, Elliot, 
Collins, Graham, Hart, &c., in America, and Ferusac, Brnogniart, 
Swainson, Sowerby, &c., in Europe. Meantime, I have lately found 
that these fine shells have acquired a great value in Europe, and 
some have sold at very high prices in England, Germany and France, 
while I have seldom derived any profit from them, but much trouble, 
expense, and even vexation. Iam determined to dispose of none left 
me, but for sale; I have as yet 400 specimens, or 60 species, of my 
Monograph in my cabinet, and all those described in this continua- 
tion, about 96 species in all, which I value from one to five dollars 
each; and even 5 species at ten dollars or more, being perhaps 
unique specimens. I offer them for sale, and have begun to sell 
upwards of 50 to Mr. Ch. A. Poulson, for his fine cabinet in 
Philadelphia. 
Some of these shells are so very rare, that I have only met them 
once in 4,000 miles of travels and explorations ; others I have never 
‘ seen, except in collections, such are the Unio ridibundus, and the 
or me & bo 
