CONCHOLOGICAL WRITINGS. 81 



1 N. G. SULCULARIA. 



109 Sp. Alasm. badium (Sulcularia badia disc. 1821.) Shell 

 thin, suboval, truncate obliqually behind, back straight, rounded 

 beneath, outside smooth bay with some faint bands, inside pale bay 

 or rufous iridescent. Length 2-3, diameter and axis -1-4 of the 

 breadth. 



Small streams of the Knobs, rare, one or two inches : tooth obtuse, 

 projection very small. 



110 Sp. Alasm. papyraceum (Sulcularia papyracea disc. 1821.) 

 Shell very thin and flat, elliptical, broader behind, truncate crenate 

 with furrows and broad ribs : outside olivaceous a little uneven, ■ 

 inside bluish. Length one half, diameter 2-9,. axis one fourth of 

 breadth. 



In East Kentucky. Very rare ; 2 or 3 inches, tooth short and 

 wide, projection with an oblique fold ; the posterior ribs are seen 

 both outside and inside. - 



III. Genus or tribe Lasmonos. 



8 N. G. Lasmonos. Cardinal tooth none, remplaced by a sinus, 

 a flat tubercle, and a decurrent enamel. Lamellar tooth curved 

 fallowing the beak. General form of Metaptera with a small coales- 

 cent wing. 



Ill Sp. Lasmonos Fragilis disc. 1822. — Shell very thin, 

 depressed, suboval, broader behind, with a small wing, some nodulo- 



sites behind, outside smooth olivaceous, inside purplish blue. Length 



[6] 

 3-5, diameter and axis 3-10 of the breadth. 



In East Kentucky, very rare, 2 or 3 inches wide. Very singular 

 shell, which I mistook at first for a Metaptera; tubercle of the 

 hinge hardly visible, lamellar tooth very long, close to the back, 

 bifid at the end . in the left valve. Type of a new Genus 

 which may include other species when sought for in the south 

 west. 



IV. Genus or tribe, Anodonta. 

 112 Sp. Anodonta inflata. disc. 1822. 



Shell thick, elliptical ; somewhat attenuated behind, very much 

 swelled, summits wrinkled, subprominent, outside olivaceous, 

 wrinkled, inside white iridescent. Length ^3-5, diameter 2-5, axis 

 3-10 of the breadth. 

 F 



