224 DESCRIPTION OF 



Hab. Stone's River, Tenn. Dr. Currey. 



My Cabinet, and Cabinet of Dr. Currey. 

 Diam. 1.2, Length 1.5, Breadth 2.9 inches. 



Shell elliptical, inflated, wide; substance of the shell thin; beaks rather promi- 

 nent, with two or three small undulations at the tip; ligament thin and rather 

 long; epidermis brown with dark green rays over the disk; anterior cicatrices 

 distinct; posterior cicatrices confluent; dorsal cicatrices none; cavity of the shell 

 very deep; cavity of the beak very shallow; dorsal line slightly curved, being 

 in the left valve elevated under the beak in the form of a lamellar tooth; nacre 

 silvery and iridescent. 



Remarks. — In form this species is closely allied to An. Ferussaciana, (nobis.) 

 Its nacre is, however, more silvery and thicker, and it has dark rays. 



Anodonta Harpethensis. Plate 19, Fig. 42. 



Testa ellipticd, inflatd, carinatd; valvulis tenuibus; natihus suhprominentibus ; apicibus undulatis; epi- 

 dermide luted et viride; margaritd salmonis colore tinctd; margine lata. 



Shell elliptical, inflated, carinate; valves thin ; beaks rather prominent; apices undulated; epidermis yellow 

 and green; nacre salmon-coloured; margin broad. 



Hab. Harpeth River, Tenn. S. M. Edgar. 



My Cabinet, and Cabinets of Mr. Edgar and Dr. Troost. 

 Diam. 1.8, Length 2.3, Breadth 4.2 inches. 



Shell elliptical, inflated, carinate; substance of the shell thin; beaks rather pro- 

 minent, with a double undulation at the apices; ligament very small and thin; 

 epidermis yellow with green bands; anterior cicatrices confluent; posterior cica- 

 trices confluent; dorsal cicatrices none; cavity of the shell deep and rounded; 

 cavity of the beaks very shallow; dorsal line irregularly curved; nacre beauti- 

 fully salmon-coloured, having a deep margin. 



Remarks. — But a single specimen of this species has come under my notice. 

 In its general form it resembles An. decora, (nobis.) It is, however, a smaller 

 species, has a broader margin, and is less inflated. The alternate bands of yel- 

 low and green give it an agreeable aspect. The nacre is of a delicate colour 

 and very satin-like. 



