372 Ohio Shells. 



L. virginicus. Collinsonia canadensis. Connmelina communis. 

 Schollera graminifolia. Ceresia fluitans. Isnaidia palustris. Che- 

 nepodium botrys. C. anthelminticum. Gentiana quinqucflora. G. 

 saponaria. Impatiens pallida. I. fulva. Lobelia syphilitica. L. 

 inflata. L. Cardinalis. Onosmodium hispidium. Elodea petiolata. 

 Mimulus ringens. M. Alatus. Mentha borealis. M. tenuis. Ge- 

 rardia tenuifolia. Verbena hastata. Zapania nodiflora. Capraria 

 multifida. Lindernia attenuata. Chelone glabra. Hyssopus ne- 

 petoides. Scrophularia marilandica. Erisimum palustre. Cleome 

 dodecandra. Strophostyles angulosa. Rudbeckia triloba. R. ful- 

 gida. Coieopsis tricosperma. Bidens bipinnata. B. chrysantlie- 

 moides. Actinomeris squarrosa. Conyza camphorata. Eupatorium 

 perfoliatum. E. Celestinum. Aster conyzoides. Prenanthes. Gna- 

 phalium uliginosum. Helenium autamnale. Eclipta procumbens. 

 Acnida cannibina. Ambrosia trifida. Asplenium angustifolium. 



Of the sliells collected in this excursion, we find thirty-six 

 species of bivalves enumerated, and four species of univalves ; 

 but as we are desirous of making a few remarks on this branch 

 of the paper, we shall now take up the neat monograph whose 

 title appears at the head of our article, and which is entirely 

 devoted to that subject. 



We mentioned in our last number, " a continuation of a mono- 

 graph of the bivalve shells of the river Ohio, and other rivers of 

 the western states," which that veteran naturalist professor Ra- 

 fincsque had just published. Since that period a translation of 

 the monograph itself has been published by Mr. Poulson, and we 

 have never seen any thing of the kind done with more ability, or 

 with less ostentation. A well executed figure of the unio verrucosa 

 is prefixed to it, which is sufticiently explanatory of the progres- 

 sive motion of the animals which inhabit these bivalves, and 

 about which there has been a groat deal of misunderstanding. 

 Conchologi>ts, we believe, are agreed now, that the laws of 

 physics may be as appropriate to the motion of shell fish as to 

 that of dray horses; and that it is as well not to have the 

 load too far from the draft power of the animal. We are 

 glad of this, a? it must have been the iron age to these little 

 mbllusca, whilst men of science gave them such prodigious long 

 trace rope?. 



Mr. Poulson dedicates his translation to William Ifembel, 

 esquire. It is not our place here to pronounce the eulogium of 



