131 



specimen of this interesting shell. It occurred in a small creek, 

 tributary to St. John's river, and on the plantation of Mr. Fatio. 

 Captain Le Conte of the Topographical Engineers, has since pre- 

 sented me with a perfect specimen, with the information that he 

 observed them in very great numbers on the shores of Lake 

 George, a dilatation of St. John's river ; that in some places the 

 dead shells were piled up confusedly to a considerable height, and 

 that the Numenius longirostra feeds upon the living animal. The 

 spire is still less elevated than that of the glohosa of Swainson. 

 PI. 14, fig. 2.* 



Melania virginica, nob. Falls of Niagara. 



Anodonta gibbosa. — Shell thin and very fragile ; much in- 

 flated ; anterior and hinge-margins compressed, the former alated ; 

 surface pale yellowish testaceous, finely radiate with green, and 

 having somewhat regular concentric minute undulations ) within 

 somewhat iridescent. 



Length about one and nine-tenths, breadth two and nine-tenths 

 of an inch. 



This shell exhibits a remarkable appearance, in the unusually 

 great convexity of the disks and umbones. It is strikingly dis- 

 tinct, and was presented to me by Captain Le Conte of the Topo- 

 graphical Engineers, who informs me that it is an inhabitant of 

 South Carolina. PI. 14, fig. 3, 4.* 



[No. 5. New Harmony Disseminator.] 



[The greater portion of the descriptions published in this work were in- 

 cluded in Mrs. Say's "Descriptions," ^c. These are copied from her re- 

 print ; the original date and page of each species is not given here, but may 

 readily be found in the Index. Those descriptions which Mrs. Say did not 

 reprint, on account of their having been repeated by Mr. Say in the " Ameri- 

 can Conchology," will be found under that head. This arrangement was 

 necessary to prevent the necessity of transcribing the descriptions to MSS. 

 The species thus omitted by me are specified in the following list, — Ed.] 

 For the following species see American Conchology. 



Unio dehiscens, Unio peksonatus, 



" ridibundps, " apiculatus, 



Alasmodonta confbagosa. 



Unio cicatricosus. — Shell transversely subovate: posterior 

 margin very short, hardly extending beyond the beaks, regularly 



* [Plate 73 of this reprint.— Ed. ] 



