196 
[On page 4 of cover of Am. Con. p. iv.] 
Notice. — In the last No. I remarked that the Alasmodonta confragosa, 
noh., was found by Mr. Barahino near the city of New Orleans ; this is 
an error altogether my own, and which I thank that gentleman for ena- 
bling me to correct. He obtained his specimens from Bayou Teche in 
the Parish of St. Mary, Louisiana, about two hundred miles N. N. W. 
from New Orleans. I did not suppose they were found in the Mississip- 
pi, and my interesting correspondent says, ‘ ‘ I have not yet discovered 
any bivalves in the Mississippi, (near New Orleans), although I have 
tried two summers successively, with an instrument made for that pur- 
pose.” 
The Ampularia urceus, L. (jugosa, Lam.) is stated in the books to in- 
habit the Mississippi river ; but I have never been so fortunate as to find 
it, or to gain any information relative to it there. Mr. 0. Evans did me 
the favor to make enquiry at various places on that river, and to exhibit, 
as somewhat similar, a colored plate of the A. globosa, Swains., to per- 
sons from whom information might be expected, and amongst others to 
some Indians, who in general are known to be accurate observers ; but 
no one has seen any similar shell in the waters of the Mississippi. I am 
therefore much inclined to believe that the species is a native of some 
of the more southern rivers, probably those of Texas. Any informa- 
tion in relation to it, or specimens of the shell, will be very acceptable. 
[Am. Con., p. v. Aug. 1832.] 
Unio lapillxjs. — Specific character. Very small, thick, radi- 
ated ; teeth very thick. 
JJ. lapillus, noh. Transylvania Journal of Medicine. Vol. 4, 
p. 528. 
Desc. Shell transversely suhoval, thick, obscure yellowish, with 
very numerous dark green radiating lines : posterior margin not 
very short, rounded : beaks hut little elevated, simple : lunule 
fusiform, very obvious : hinge margin and anterior margin a little 
depressed, declining gradually in an arquated line : anterior basal 
margin rounded : basal margin nearly rectilinear in the middle : 
within pearly white ; cardinal teeth direct, thick ; lateral teeth 
thick, oblique with respect to the base : cicatrices very deep and 
rounded : cavity of the beaks almost obliterated, with a series of 
small cicatrices, extending downwards and backwards. 
Ohs. The robust teeth and the thickness of the whole shell, 
