131 
specimen of tliis 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 
Q-eorge, 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 globosa of Swainson. 
PI. 14, fig. 2.* 
Melania virginioa, nob. Palls 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 worh were in- 
eluded in Mrs. Say’’s Descriptions f ^c. These are copied from her re- 
print ; the original date and page of each species is not given here, hut may 
readily he 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 peksoxatus, 
“ EIDIBUNDUS, “ APICULATUS, 
Alasmodonta confkagosa. 
Unio cicatricosus. — Shell transversely subovate; posterior 
margin very short, hardly extending beyond the beaks, regularly 
* [Plate 73 of this reprint. — E d.] 
