82 AMERICAN JOURNAL 



Eafinesque describes the foYloyv'mg Jlelices : — 



Aplodon nodosum, 1819, (p. 28.) — Not identified. 

 Toxostoma globularis, 1831, (p. 47.) — Not identified, 

 Mesodcn maculatum, 1831, (p. 67.) — Not identified. 

 Omphalina cnprea, 1831, (p. 68.) — Is possibly 



a. fulginosa. 

 Xolotrema clausa, 1831, (p. 68.)==^. infleda, Say, 



identity first established by W. G. Binney. 

 Triodopsis lunula, 1831, (p. 68.) — I agree also 

 witb "W. G. Binney in considering this a 

 synonym of H. indentata, Say. 

 Mr. Eafinesque also described several species of naked 

 snails, none of which can be identified: — 

 Agatina variegata, {p. 6S,)= Achatina fasciaia, {yar. picta Eve?) 

 Agatina fuscata, (p. 68,)= same. 



Various land shells from Buenos Ayres, (p. 93,) we cannot 

 identify; but the five new species of freshwater shells from 

 Bengal and Assam, described on the same page, are easily 

 recognizable, but cannot be adopted, other names having 

 priority. 



Among the univalve fresh water shells of the United 

 States, described by Eafinesque, the following appear to us to 

 be worthy of recognition : — 



Pleurocera. This we have adopted instead of Ceriphasia, 

 Sw., and Trypanostoma, Lea, for species of Strepomatidse be- 

 longing to the group of Melania canalicidata, Say. Of the 

 several species described, P. verrucosa alone can be recognized ; 

 it is the same as Melania nupera, Say. 



Amhloxis is the same as Melantho, Bowditch, as we have 

 ascertained by the figures of two of the species in Eafinesque's 

 manuscript "Conchologia Ohiensis," but it is questionable 

 whether the published description is sufiiciently explicit to 

 warrant its adoption : — does it not equally refer to AncuJosa ? 

 Ellipstoma (p. 23 and 27) appears to us to be also referable 

 probably to Anculosa. 



Oxytrema (p. 26) is a Melanian, and would perhaps answer 

 well to the heavy pupasform Oonlohases of North Alabama. 



Carnpeloma. Prof. Gill says i\)XB= Melantho, and that the 

 species described (C. crassula,)= Paludina heierosfropha, Kirt- 

 land. The description does not seem to us to warrant this refer- 

 ence any more than it would to a Physa. 



Omphiscola, (p. 26.) This name may be applied pretty 

 certainly to the group of Limnasans represented by L. umhili- 

 cata, Ads., L. Adelinse, Tryon, &c. 



Leptoxis (p. 26) has been adopted by Haldeman, H. & A. 

 Adams, Chenu, and many other naturalists, instead of Anculosa, 

 Say. There is positively no excuse for this. The description 



