NAIADES. 



57 



In Mr. Rafinesque's Monograph, and in his subsequent Papers, are inserted descriptions 

 under the following names. Not being able to identify them, I have deemed it better 

 simply to give a catalogue of them. Those which I suppose I have identified will be 

 found in the foregoing table. In this list, I have not divided the Uniones into his numerous 

 genera. The want of adequate figures, and an absence of sufficiently accurate description, 

 together with Mr. Rafinesque's well-known proclivity to make species out of imaginary 

 forms and specimens, induced me, after repeated and vain attempts to recognize his species, 

 to follow the example of Mr. Say, Mr. Barnes, and all the other American malacologists up 

 to the time of commencing my memoirs on this subject, to avoid any further attempt to 

 elucidate a mass of confusion which was considered beyond the pale of science. The 

 views of the late Dr. Binney, in his Terrestrial Molluscs of the United States, in relation to 

 the claims of this writer, are so conclusive that it is only necessary for any unprejudiced 

 mind to examine the facts and be perfectly satisfied that Mr. R. has, so far from advanc- 

 ing science by his writings in this branch, been the cause of inextricable confusion, from 

 the embarrassment of which we can only be relieved by altogether avoiding any further 

 attempt to make out his imaginary species. M. Ferussac, who made vain attempts to 

 understand his division and species, says that the shells he sends away augment the diffi- 

 culties in knowing his own species, and that he had received the same shells under different 

 names, and others with the names evidently different from those given in his monography ; 

 that the difficulty, therefore, is inextricable in the determination of his species, &c. 



Alasmodonta atropurpureum ? 

 badium ? 

 costata ? 

 hians ? 

 ponderosum ? 

 papyraceum? 

 rugosum ? 

 sulcatum? 

 scriptum? 

 viridis ? 



Anodonta atra ? 



aperta ? 

 cuneata ? 

 digonota ? 

 inflata ? 

 lata? 

 Ohiensis ? 

 solenoides ? 



Unio antrosa ? 



atroviolacea ? 

 argyratus ? 

 15 



Unio attenuata? 

 aurata? 

 bicolar ? 

 bullata ? 

 biloba ? 

 cardium ? 

 Cliffordiana? 

 calendis ? 

 chloris ? 

 castaneus ? 

 costata ? 

 crassa ? 

 cinerescens ? 

 cordata ? 

 cuneata ? 

 cy clips ? 

 cuprea ? 

 cyphia ? 

 decorticata ? 

 depressa ? 

 diploderma ? 

 diapbanus ? 

 dilatata ? 



Unio ellipsaria? 

 elliptica? 

 fasciata ? 

 fulvus ? 

 fontinalis ? 

 fulgens ? 

 fasciola ? 

 fasciolaris ? 

 flava ? 

 flexuosa ? 

 flexus ? 

 fragilis ? 

 gibbosa ? 

 granulatus ? 

 interrupta? 

 lateralis ? 

 latissima ? 

 leptodon ? 

 laevigata ? 

 lamobrachys ? 

 lineolata ? 

 lividus ? 

 megaptera? 



