THE NAUTILUS. 



VOL. ix. MAECH, 1896. No. 11 



NEW FLORIDA UNIOS. 



BY BERLIN H. WRIGHT, PENN YAN, N. Y. 



Unio Hartwrightii * t ,. nov. PI. II, %s. 4, 5, 6. 



Shell smooth, elliptical, inflated, pointed or subbiangulated pos- 

 teriorly, well rounded anteriorly, inequilateral ; rather thin and 

 hard, slightly thicker in front; beaks very prominent, with two or 

 three obscure wide undulations in one series ; epidermis dark chest- 

 nut-brown with faint green rays, more or less disposed in fascicles 

 over the entire disk; growth lines barely distinct; umbonial slope 

 raised into an abrupt high ridge on the upper half, and rounded 

 and flattened below; dorsal area wide, carinate, nearly cordate and 

 usually with numerous heavy wrinkles or sharp folds; cardinal 

 teeth double in the left and simple in the right valve, divergent, 

 crested, rather short and subcompressed ; lateral teeth long, striate 

 and thin ; nacre pinkish-purple and in concentric zones towards the 

 margins, highly iridescent, and especially so on the posterior half; 

 cavity of the umbones rather deep ; posterior cicatrices confluent, 

 anterior ones distinct, and the dorsal ones few and in a short line 

 under the hinge plate. 



Hah., Lake Beresford, Florida. 



Types in the collection of the author, cabinet of Mrs. Geo. An- 

 drews, Knoxville, Tenn. and Museum Acad. Nat. Sciences, Phila. 



