106 DESCRIPTION OF NEW 



considerably larger. It has a strong resemblance to U. luteolus (Lam.) 

 and to U. Hydianus (nobis), but does not, like them, possess distinct 

 rays. 



Anodonta subcylindracea. Plate XXIV. fig. 117. 



Testa elliptica, infiata, subcylindracea, valdh inaquilaterali ; valvulis tenuibus; natibus 

 subprominentibus undulatisque; epidermide fused; margarita suhcarulea et iridescente. 



Shell elliptical, inflated, nearly cylindrical, very inequilateral; valves thin; beaks 

 somewhat prominent and undulated; epidermis brown; nacre bluish and iridescent. 



Hab. Oak Orchard Creek, Orleans County, New York. J. C. Jay, 

 M.D. 



My Cabinet. 



Cabinet of Dr Jay. 



Diam. -8, Length 1-1, Breadth 2-2 inches. 



Shell elliptical, inflated, rounded at both ends, nearly cylindrical, 

 very inequilateral ; substance of the shell very thin ; beaks somewhat 

 prominent and minutely undulated at the tip ; epidermis brown, and 

 without rays ; anterior cicatrices confluent ; posterior cicatrices con- 

 fluent ; dorsal cicatrices not perceptible ; cavity of the shell deep ; cavi- 

 ty of the beaks very shallow ; nacre bluish and iridescent. 



Remarks. — This Anodonta resembles, particularly in an immature 

 state, the An. Ferussaciana (nobis). It is not, however, so large a shell, 

 and the beak is more terminal. The undulations of the beaks, which 

 are nearly concentric, are also smaller. Dr Jay very kindly placed 

 the shell above described at my disposal many months since. 



